I AD-A119 834 NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL F/G 14/2

EVALUATION OF C OMMERCIALLY AVAILABLE, WRIST-WORN DEPTH GAUGES. CU)

JUN AZ J R MIDDLETON, J F TOBIAS, B E WEBB

UNCLASSIFIED NEDU2A2 N

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DEPARTMENT OF THE IAVYNAVY EXPERIMENTAL DIVING UNIT

PANAMA CITY. FLORIDA 32407

NAVY EXPERIMENTAL DIVING UNIT

REPORT NO. 2-82

EVALUATION OF COMMERCIALLYAVAILABLE, WRIST-WORN DEPTH GAUGES

JAMES R. MIDDLETON

JONATHAN F. TOBIASBILLY E. WEBB

JUNE 1982

Approved for public release; distribution unlimited

Submitted by: Reviewed by: Approved by:

•pJ.R. MIDDLETON D.G. WHALLTest & Evaluation LCDR, USN CDR, USNEngineer Senior Projects Officer Commanding Officer

J.F. TOBIAS E.D. THAILMANNENS, USN CDR, MC, USN - ,Ass't. Test & Evaluation Senior Medical Officer 'k

Engineer

3.E. WEBB " -KENS, USN CDR, USNAss't. Test & Evaluation Executive Officer

Engineer

k J (jo)N STATL'dApproved for PubySra.

Dusatbion Urnge.

L30 rlung

UNCLASSIFIEDqtc:7V L.ASIFIATIO4 O TP4S PGE Men O* Z1100d)READ INISTRUCTIONSREPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM

REPORT mumber 12. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG N.UMBER

4 'Y..E (ad Subtitle) s. TYPE Olt REPORT & PERIODi COViERE

EVALUATION OF CO4SRICIALLYAALABLE, W~IST-WORN DEPTH GAUGES T~f~Ro~rba

S. opERPORmiNG ORG. REPORT NUMBER

AUTWOR~~d) 8. CONTRACT ORt GRANT NUM11111IIIII3)

JONM. PRORA TOBIASROEC.AS

I WPIEFORMIN ORGANIZATION MAMIE AND ADDRESS AREA & WORk UNIT NUMUERS11111

NAVY EXPERIMENTAL DIVING UNITPANMA CITY- FLORTh 1!7LA7 _____________

I. -ONTROL~i.I oiPPice NAME AND) ADDRESS 12. REKPORT DATE

14 kMONITORING AGENCY NAME G ADDRIESSQif 011#01t0411 C~MWW#Md Offi..) is. SECURITY CLASS. (of iis a .

Unclassified

1114k DieC~ ASSIFICATION/0OOW1NGRAINIGSH1DULIE

16. DISTRIBUTION STATEMENT (.f 11 AD.ewt)

Approved for public release; distribution unlimited

t?. DISTRIBUTION STATEMENT (01thei 8aS9fft 81100 41 i 810"* 20. if ED1100-1 6- *iPaeD)

IS. SUPPLEME1NTARY NOTES

It. KEY WORDS (cenno.. an fe'au" aide ofPD ee maaamvienuirDD5 aa eisitat~)

Depth Gauge Repeatability[Wrist-worn Thermal StabilityFeet-of-seawater Readability--

4AC uracy

020. A5 4AC I'Cosnnm m .'w aies it nesse.aaind fd..u, by bleak M0m0~Twenty-tight models of cocisercially available, diver, wrist-worn depth

gauges were evaluated by the Navy Experimental Diving Unit. All gauges weretested to determine accuracy, repeatability, watertight integrity, thermalstability, durability, readability and luminescence capability. The depthgauges tested represented a comprehensive survey of the available market.Test results showed the vast majority of the models to have an accuracy of ~Fsw. Under some test conditions, this degraded to *10 FSW or greater. Two

DID 1473 EDITION Oo I NiOV so is ossoLEE UNCLASSIFIEDS/N 0102-LF-014-6601 scmt loi~o rTi A nm3 mf

UNCLASSIFIEDSECU01tv CLASSIFICATION OF THIS PAGE fUMG Does Enltro)

isamples of each model were tested. In several cases, gauges marketed bydifferent manufacturers actually had the same internal mechanism. Given therepeatability, size of the gauges, cost and manufactc-ing techniques availableto the industry at the current time, no operational difference was perceivedin the performance of any gauge evaluated. Once a calibration check has beenperformed, all are considered satisfactory for U.S. Navy SCUBA use, with theexception of special explosive ordnance disposal non-magnetic requirements.; I

r, o justif icatior ... ..

BY-Ce' ~Dis~tribt n!

UNCLASSIFIIDSECURITY CLASSIFICATION OF THIS PAgif(Wom Dft, Ona

Acknowledgements

,he authors would like to express their appreciation to the followingpeople for their contribution to the testing, data reduction and analysischca contributed to the production of this report.

Karen M. KOHANOWICH, Ensign, United States Navy

Eric RANDALL, Ensign, United States Navy

Jeffrey N. ZERBE, Ensign, United States Navy

iv

Table of Contents

Page

Report Documentation Page ........................................... iiAcknowledgements .................................................... ivTable of Contents ................................................... vGlossary ............................................................ viAbstract ............................................................ vii

Section

I. INTRODUCTION................................................ 1

I. EQUIPMENT DESCRIPTION ......................................... 1

U11. TEST PROCEDURE

A. Hyperbaric Chamber Tests(1) Accuracy/Repeatability Tests .......................... 1(2) Watertight Integrity Tests ............................ 1(3) Thermal Stability Tests ............................... 2(4) Durability Tests ...................................... 2

B. Open-Water Tests(1) Readability/Luminescence Tests ........................ 2

IV. RESULTS ....................................................... 3

V. DISCUSSION ..................................................... 6

VI. CONCLUSIONS ................................................... 8

VII. REFERENCES .................................................... 9

VIII. KEY TO APPENDIXES ............................................. 9

APPENDIX A - List of Gauges and Manufacturers ...................... A-i thru A-3APPENDIX B - Gauge Descriptions .................................... B-1 thru B-9APPENDIX Cl -Maximum Deviations - Descending at 70"F ............... Cl-l thru CI-2APPENDIX C2 - Maximum Deviations - Ascending at 70"F ................ C2-1 thru C2-2APPENDIX DI - Maximum Deviations Control Group - Descending at 700F. DI-l thru Dl-2APPENDIX D2 - Maximum Deviations Control Group - Ascending at 70"F.. D2-1 thru D2-2APPENDIX El - Maximum Deviations - Descending at 90"F ............... El-i thiu E1-2APPENDIX E2 - Maximum Deviations - Ascending at 90"F ................ E2-1 thru F2-2APPENDIX Fl - Maximum Deviations - Descending at 32"F ............... FI-I thru FI-2APPENDIX F2 - Maximum Deviations - Ascending at 32"F ................ F2-1 thru F2-2APPENDIX G1 - Maximum Deviations Following Durability

Test - Descending at 700F ............................. Gl-I thru GI-2APPENDIX G2 - Maximum Deviations Following Durability

Test - Ascending at 70"F .............................. G2-1 thru G2-2APPENDIX H - Diver Questionnaire ................................... H-i

v

Glossary

Aiuracv The extent to which a given measurementagrees wi0 -he standard value for that

measurement

3ourdon Tube A pressurized sensing element with a curvedor twisted metal tube, flatened in cross

section and closed

Degrees Fahrenheit

FSW Feet-of-Seawater

Mil Spec Military Specification MIL-G-15214C (Gauge,Depth, Wrist, MARK I, MOD 0, Nonmagnetic,Self-Luminous Dial, 30 March 1965)

NAVSEA Naval Sea Systems Couand

NEDU Navy Experimental Diving Unit

NO. Number

OPT Optional

Percent

?sig Pounds per Square Inch Gauge

Repeatability The extent to which a given measurementduplicates previous measurements taken under

the same conditions.

USN Unites States Navy

Watertight Integrity Ability to prevent water leaks into and/or

air/oil leaks out of

vi

1A~

Abstract

Twenty-eight models of commercially available, diver, wrist-worn depthgauges were evaluated by the Navy Experimental Diving Unit. All gauges were

tested to determine accuracy, repeatability, watertight integrity, thermalstability, durability, readability and luminescence capability. The depth

gauges tested represented a comprehensive survey of the available market.Test results showed the vast majority of the models to have an accuracy of +5TSW. Under some test conditions, this degraded to +10 FSW or greater. Two-samples of each model were tested. In several cases, gauges marketed bydifferent manufacturers actually had the same internal mechanism. Given therepeatability, size of the gauges, cost and manufacturing techniquesavailable to the industry at the current time, no operational difference wasperceived in the performance of any gauge evaluated. Once a-calibrationzheck has been performed, all are considered satisfactory for U.S. Navy

SCUBA use, with the exception of special explosive ordnance disposal

non-magnetic requirements.

vi

vii

INTRODUCTION

During January and February 1981, the Navy Experimental Diving Unit,NEDU) tested 28 commercially available, diver wrist-worn depth gauges inaccordance with NAVSEA Task Number 79-6. The depth gauge, which allowsmonitoring of actual depth in FSW, is a vital apparatus on which the divermust depend at all times. Unmanned tests were performed to determineaccuracy, repeatability, watertight integrity, thermal stability, durability,readability and luminescence capability on all depth gauges. Appendix A:ontains a list of gauges tested and the manuiacturers.

The scope of these tests did not include cycle life testing of thegauges or the length of time a gauge may be expected to remain in calibrationduring normal use. Since Navy use of diver wrist-worn depth gauges requiresfrequent calibration checks these evaluations were not deemed necessary.

Capillary type depth gauges were not evaluated since there is nointernal pressure sensing mechanism involved, and their accuracy is implicitin the design. The only limiting factor in a capillary gauge is that, sinceit follows Boyles Law, the graduations on the face of the gauge get very closetogether at depths beyond 60 FSW which effects readability.

II. EQUIPMENT DESCRIPTION

The 28 models tested are described in APPENDIX B and illustrated inFIGURES I through 28. The descriptions are those supplied in themanufacturers catalogs and represent features which they feel are unique totheir model.

Ill. TEST PROCEDURE

A. Hyperbaric Chamber Tests:

1. Accuracy/Repeatability Tests (see definitions in glossary):Each gauge (two of each model) was compressed in an ambient temperature waterbath (approximately 70"F) to its maximum working depth in a hyperbaricchamber. The water bath just covered the top of the gauges and was used tocheck for leaks. Accuracy readings were taken in 10 FSW increments on descentand ascent. Gauge readings were compared to a digital ASHCROFT 0-200 psigDigigauge (+ 0.05Z accuracy). A total of three compression/decompressionscenarios were recorded on each gauge to determine repeatability. Since thepurpose of these tests was to evaluate the performance of new, previouslyunused gauges, cycle life testing consisting of numerous compressions tomaximum depth was not conducted. Two gauges of each model were tested onlyduring the Accuracy and Repeatability Tests. Therefore, one of each model wassubjected to all phases of testing, while the other was tested only foraccuracy and repeatability in 70"F water. This was done to give an indicationof the quality control available in each model.

2. Watertight Integrity Tests: Gauges were observed for watertightintegrity on all chamber and open-water dives.

.... I. ... .i

3. Thermal Stability Tests: Each gauge (one of each model) was:impressed to its maximum operatling depth in both a 90"F and 32"F water bath,n a hyperbaric chamber. Accuracy was recorded during descent and ascent in.J TSW increments to determine if changes in accuracy were caused by thermalstress.

4. Durability Tests:

a. Each gauge (one of each model) was dropped from a height ofthree feet onto a concrete floor with the dial face up and then placed in ahyperbaric chamber for an accuracy test consisting of a single compression toits maximum operating depth while immersed in 70"F water. Accuracy wasrecorded during descent and ascent in 10 FSW increments to determine ifzhanges in accuracy had been caused by impact. The test was designed tosimulate the type of blow a depth gauge might receive while being moved from

?lace to place in a diver's gear bag or if accidentally dropped.

b. In addition to the drop test, durability testing alsoconsisted of inspecting each gauge for corrosion following salt waterimmersion.

NOTES:

(a) During all chamber tests, depth was controlled to within + 0.23 FSWaccording to an ASHCROFT Digigauge.

(b) When evaluating the data tabulated in this report, account must begiven to the error the testors make in reading the face of the gauge. Theerror in reading the depths from the face of the gauge was, at best, + 1 FSWand, at worst + 2 FSW. Thus, the best accuracy expected from any of thesegauges would be in the range of + 2 FSW.

B. Open-Water Tests:

1. Readability/Luminescence Tests: A test platform was constructedon which one of each gauge model was mounted. Following mounting, the gaugeboard was taken to 60 FSW in the Gulf of Mexico. A minimum of 8Navy-qualified divers judged readability of all gauge models at depth on dayand night dives. A questionnaire was filled out at depth by each diver on alldives. On night dives, readability was determined by each gauge's ownluminescence after it had been activated by an incandescent, hand-heldunderwater light. The time of activation for the depth gauges waspredetermined in a darkened lab by subjecting the gauges to different periodsof direct incandescent light. A nominal time of 15 seconds was chosen to bestsatisfy overall luminous activation of the depth gauges. In order tostandardize the readability testing, each diver's vision was required to be20/20 or corrected to 20/20 by appropriate means. The distance from which themounted depth gauges were read underwater was left to the diver's discretion.

2

Results

A. Accuracy & Repeatability Tests:

The vast majority of gauges tested were accurate to within + 5 to- "3 FSW under most test conditions. Data showed the majority of gauges to bes'ightlv more accurate during descent than ascent. Accuracy on most gaugeswas best at 70*F. One gauge was off by as much as 20 FSW. Since only two ofeach model gauge were tested it was not known whether or not performance ofthis gauge was indicative of this particular brand. However, this particulargauge was identical internally to several other brands which were off by only2 to 5 FSW at 32"F. This highlights the difficulty in calibrating on a massproduced basis small, wide range depth gauges with current state-of-the-arttechniques. These large variations, however, occurred for the most part in32"F water, an extreme condition where conservative diving practices arealready in order.

Three compression/decompression scenarios were run on two gauges ofeach model at 70"F and repeatability was + 1 FSW for all gauges tested. Inaddition, most gauges posessed a constant degree of error factor i.e., thegauge varied from true depth by a relatively constant number of FSW. However,

all gauges did read zero when on the surface.

Examination of the data also shows that most gauges had much betteraccuracy at depths of 130 FSW and shallower. Most gauges at 70°F were within+ 5 FSW accuracy to a depth of 130 FSW. Deeper than 130 FSW, accuracydiminished to between + 5 FSW and + 10 FSW for most models. This is importantsince 0 to 130 FSW is the depth range for the vast majority of SCUBA dives.

TABLE I Range of Error (FSW) vs Depth and Temperature, contains asummary of data taken under all test conditions for each gauge. Depths aredivided into two depth ranges, 0-50 FSW and 51-200 FSW. The numbers containedin the blocks beside each model represent the minimum and maximum deviationsin FSW from true depth for a particular depth range and water temperature.For example, the DACOR LFG-300 at 70"F between 0 and 50 FSW was always atleast 5 FSW deeper than true depth and had a maximum deviation from a truedepth of 7 FSW. Data is tabulated to a maximum depth in TABLE 1 of 200 FSWsince 130 FSW is the maximum limit for open-circuit SCUBA diving in the U.S.Navy. APPENDIXES Cl and C2 and Dl and D2 contain a complete tabulation ofdata for each of the two gauges tested in every model at depths to 300 FSW.

NOTE: Data contained in APPENDIXES Dl and D2 is for the control gauges whichwere tested only at 70*F for accuracy and repeatability. The gauges tabulatedin APPENDIXES Cl and C2 were also tested at 32 and 90"F, respectively, anddropped from 3 feet onto a concrete floor after the initial evaluation at70"F. By comparing the data in APPENDIXES Cl and C2 with Dl and D2, there aremany obvious differences between two gauges of the same model at the samedepth. This provides a realistic indication of the comparative performancethat a diver can expect from two identical gauges. Variations between thesame gauge ranged from 0 to 15 FSW under identical test conditions. This madenormal statistical analysis of the data impractical. Consequently,statistical data such as correlation coeffiants, standard diviations, linearregressions and degree of confidence are not included in the data presented.

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3. Waterright Integrity Tests:

Each gauge was pressurized underwater a total of 14 times including- 3nen-water dives. All gauges tested maintained 100% watertight integrity:nroughouc :he evaluation.

C. Thermal Stability Tests:

All models were evaluated in 32 and 90"F water, respectively, todetermine the effects of thermal stress. At 32°F, there was a distinct trendobserved where the majority of the gauges read shallower than they did atO'F. Some varied by only 1 to 3 FSW, but several read as much as 10 to 15

-3. shallower at 32°F than measured at 700F. In most cases however, the shiftwas not significant.

In 90°F water, the trend was reversed to a lesser degree. MostYauges gained 1 to 3 FSW over the 70"F reading, but no major accuracy changeswere noted as was the case in 32"F water.

TABLE I provides a summary of the range of errors at 90 and 32"F.APPENDIXES El, E2 and Fl, F2 tabulate complete results for 90 and 32*Ftemperatures, respectively, for one gauge of each model tested.

D. Durability Tests:

All of the gauges passed the durability tests with minimalvariations in accuracy and repeatability as compared to the 70"F tests.

No corrosion problems were observed with any gauge after salt waterimmersion as long as they were washed thoroughly in fresh water following eachlive.

TABLE I summarizes the accuracy tests performed after the 3 footdrop to a concrete floor. APPENDIXES Gl and G2 gives a complete tabulation ofaccuracy data following the pressure drop test from 0 to 300 FSW.

E. Readability/Luminescence Tests:

All of the gauges tested were found to be adequately readable,i.e. ease of determining the actual depth reading from the dial face. Inaddition, all models which were advertised as being luminescent, were in fact,highly readable under low-light conditions after activation by an incandescentlight source such as a divers hand held light. The gauges remained highlyluminescent for approximately 5 minutes after activation. The only gaugestested which was not designed for luminesence were the DACOR SFG 150 andSFG 300.

V. Discussion.

Since 1965, depth gauges have been evaluated for accuracy according toMIL-G-15214C (see References). This specification was developed in order tobuild, under contract, an extremely accurate, nonmagnetic depth gauge

6

I'

se::iL'.v for use by U.S. Navy Explosive Ordnance Disposal Divers. Thispe. zae =led for a gauge accuracy of + 1 FSW between 0 and 50 FSW and + 3

FS; Detween 50 and 200 FSW. This is an extreme requirement and cannot be met

nv mass-produced, commercial depth gauges in price ranges generally consideredaffordab e. Consequently, the gauges evaluated in this report are not.,cared to this Mil Spec.

The majority of the gauges tested read deeper than true depth under all:est zonditions. This is an obvious safety advantage to the diver from adecompression standpoint, but cannot be assumed carte blanc, since some models

read shallower than true depth.

importantly, when analysing the data contained in this report, remember:hac al. models use a very similar mechanism for sensing pressure. Many5auges, marketed by different companies, are exactly the same gauge with4ifferent dial faces and commercial logos. This becomes significant when twomodels with the same internal mechanisms read + 10 FSW different underidentical test conditions. This makes it difficult to state categorically:hat one model is superior to another when, in fact, they may be exactly thesame gauge.

in addition, test results showed repeatability of all gauges tested tobe excellent (i.e. identical test conditions yielded nearly identical resultson the same gauge after multiple compression/decompression scenarios).

Consequently, any of the gauges tested may be used safely after comparing themto a known standard. This standard may be a calibration check in a hyperbaricchamber, use of a descent line marked in 10 FSW increments or comparing thegauge against known sea floor depths.

A 0 to 150 FSW depth gauge is commonly believed to be more accurate thana 0 to 300 FSW depth gauge in the 0 to 150 FSW range. The data in this reportdoes not support this belief. While there is a definite trend in all gaugestested to become somewhat less accurate as depth increases, the deeperindicating gauges are normally as accurate as the shallower indicating gaugesat corresponding depths.

Durability testing showed the rubber covers which protected all modelsagainst impact to be effective as long as the gauges were dropped in the dial

face up position. This is significant since any blow to the side of a gaugeis likely to cause the gears in the mechanism to jump and ruin its calibrationpermanently. This is considered reasonable and acceptable when consideringthe type of internal mechanisms found in these gauges. Any depth gauge shouldhave a calibration check when it has been subject to an unusual shock or ifperformance is suspect for any reason. No corrosion problems were encounteredduring the evaluation.

Gauges were tested to a maximum depth of 300 FSW even though severalmodels indicated depths substantially deeper, well beyond realistic safe

limits with open-circuit SCUBA. The U.S. Navy Diving Manual limitsopen-circuit SCUBA dives to 130 FSW. No descernable difference was observedbetween types of sensing mechanisms, i.e. bourbon tube, diaphram or a

7

on J; the two. However, two models, the TEKNA T-2600 and the

:Nc.N "ECH:ONICS DG-10 had a zero-adjust mechanism, which allows the gauge:.e re-zeroed at altitude or specifically calibrated for a given depth.

7.ese features, while not affecting the overall accuracy as tested by NEDU,-ay e Jsefu: ;n special situations. However, important to note is that thisre-Zerong zapabilicv does not correct these gauges for changes inie:ompression calculations considered inherent in altitude diving.

.he FARALLON 04-1630 has a maximum depth indication feature whichautomatically records the maximum depth reached on a given dive. This could:rove efective and become quite useful in a multi-depth dive scenario.

Several gauges had expanded scales at the shallower.depths. While this-eartre definitely enhances readability, these gauges were found to be nomore accurate than the other models tested.

Finally, important to understand is that depth gauges, either militaryr :aozercial, are delicate instruments and cannot be expected to maintain any4ezree of accuracy if not treated as such.

". CONCLUSIONS

The overall conclusions which can be drawn from the results of this testare as follows:

A. Accuracy of the vast majority of gauges tested was + 5 FSW from 0 to50 FSW and * 10 FSW from 51 to 130 FSW under all test conditions.

3. While accuracy of identical depth gauges may vary from unit to unit,reDeatability of all models tested is essentially the same.

C. Accuracy of current diver wrist-worn depth gauges is reasonable:onsidering the state-of-the-art in manufacturing techniques and the unitprice increase which would occur if a higher accuracy were required.

D. A custom calibration, i.e. a comparison of the depth gauge against aknown standard on each individual gauge, should be performed by the userincluding new gauges). This known standard may include hyperbaric chamber

testing, a descent line marked in 10 FSW increments or by comparing the gaugeagainst various known depth areas of the sea floor. The diver should thendive by his calibration sheet rather than the actual reading on the gauge.

E. Gauges should be checked for accuracy, at least, once every six-onths or any time the calibration is in question.

F. The fact that a depth gauge is reading zero on the surface and iscorrect at a known depth does not necessarily mean that its calibration isstill intact over its entire depth range.

G. Commercially produced diver depth gauges are considered sufficientlyaccurate and durable for U.S. Navy use as long as the limitations outlinedherein are recognized and the diver responds accordingly.

8

k . I!

.. ..R~E CES

M t:3r Spezificacion MIL-G-15214C, Gauge, Depth, Wrist, Mark I Mod 0No'image: ie' -,.urinous Dial, 30 March 1965.

V -. KEY T APPENDIXES

-he values in APPENDIXES Cl through C2 were obtained by comparing the:es: depth gauge to the ASHCROFT 0-200 psig Digigauge. If the difference5e:ween the test gauge compared to the Digigauge was shallow, it isrepresented yv the corresponding value in negative FSW. If the differencedas deeper, Lt is represented by the corresponding value in positive FSW.

The appendixes are subdivided into descending and ascending data withA??ENDIX C! zontaining descending data and APPENDIX C2 containing ascending4ata. APPENDIXES Cl through G2 are designated in this manner.

9

W-b

APPENDIX A

LIST OF GAUGES AND MANUFACTURERS

M.NFACURER MODEL NAME/NO. ADDRESS

,. DACOR SFG 150 DACOR CORPORATION161 Northfield Road

" AC.)R LFG 150 Northfield, IL 60093(312) 446-9555

3. DAC)R SFG 300

ACOR LFG 300

;.FULLON 04-1610 FARALLON/OCEANIC14275 Catalina Street

i. .kRALLON 04-1630 San Leandro, CA 94577

200' MAX DEPTH GAUGE (415) 352-5007

" ?ARAL..ON 04-1620

3. ?ARKv;AY 801900 PARKWAY FABRICATORS, INC.241 Raritan StreetSouth Amboy, NJ 08879(201) 721-5301

4. ?RINCETON DG-10 PRINCETON TECTONICSTECTONICS P.O. Box 8057

Trenton, NJ 08650(609) 298-9331

'0. SCUBAPRO CAPSULE DEPTH GAUGE SCUBAPRO USA150 FSW 28-849 3105 E. Harcourt

Rancho Dominguez, CA 90221

!I. SCUBAPRO CAPSULE DEPTH GAUGE (213) 639-7850230 FSW 28-850

12. SCUBAPRO ALTITUDE ADJUSTABLE DEPTHGAUGE 250 FSW 28-503

13. SCUBAPRO CAPSULE DEPTH GAUGE325 FSW 28-012

14. SCUBAPRO ALTITUDE ADJUSTABLE DEPTHGAUGE 500 FSW 28-507

A-I

&bom

APPENDIX A

'"T OF GALGES AND MANUFACTURERS (Continued)

.A_ _"_A%:_ MODEL NAM ElNO. ADDRESS

SEAPRO DM-250 SEAPRO, INC.

18030 South Euclid StreetFountain Valley, CA 92708(914) 979-6730

• . SEAQU'ES 010 SEAQUEST, INC.722 Genevieve Street

. SEAQ'EST 8012 Suite N

Solona Beach, CA 92075(714) 979-6730

. SHERWOOD DG-350 SHERWOOD SELPAC CORP.

120 Church StreetLockport, MY 14094(716) 433-3891

1?. SPORTSWAYS 1406 WATERLUNG (SPORTSWAYS)

P.O. Box 2407Huntington Park, CA 90255(213) 379-2491

20. SUB-AQUATIC 2089 SUB-AQUATIC SYSTEMSSYSTEM4S P.O. Box 711

530 Sixth Street21. SUB-AQUATIC 2069 Hermosa Beach, CA 90254

SY STEMS (213) 379-2491

22. TEKNA T-2600 TEKNA3549 Haven AvenueMenlo Park, CA 94025(415) 365-5112

A-2

.4

APPENDIX A

:.ST OF GAUGES AND MANUFACTURERS (Continued)

.; F AC7U.RER MODEL NAME/NO. ADDRESS

" J <,RS DEPTH MASTER I1 U.S. DIVERS COMPANY7044 3323 West Warner Avenue

Santa Ma, CA 92702

-.3. DIVERS DEPTH MASTER 1 (714) 540-8010704'2

.. DIVERS DEPTH MASTER I7043

.. DIVERS DEPTH MASTER 117045

" 1'ZE STAG * 51246 OCEAN DYNAMICS 1NT.363 W. Victoria Street

:i. WH ITE STAG * 31247 Gardena, CA 90248(213) 538-9540

'WHITE STAG is now OCEAN DYNAMICS INTERNATIONAL

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Figure 17. SEAQUEST 8012 Figure 18. SHERWOOD DG-350INI

Figure 19. SPORTSWAY 1406 Figure 20. SUB-AQUATIC SYSTEMS 2089

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APPENDIX H

DIVER QUESTIONNAIRE

Readabi lity Rating _-

:e:- 3aL.ge Mocei 0 Poor Fair Good Excellent

,' 3EA ;uEST. 80108012

3, -A..2"N: 04-1610 ________ ________________

04-1620

04-1630

,4 SE-9.3C: SDG-350

5; "EKN : T-Z600

., viTE ST'G: 51246

51247

(7) SAS: 2089 __

2069

,' ACOR: LFG 150

LFG 300

SFG 150

SFG 300

(9) SPORTSWAYS: 1406

(10) SC BAPRO: 28-849

28-850

28-012 _

28-507

28-503 _

(II) J.S. DIVERS: 7042 !-

7043 __

7044 __________________

7045 ________ ________ ________

(12) SEA PRO: om 150 __

OM 250

)IvER'S NAME:

RAT/NEC:

TYPS OF DIVE: DAY

NIGHT

S I GNAT __RE_:

H-!