Chapter 2- Diving Equipment Diving Equipment 31 will also test and adjust the intermediate pressure of your first stage during the service. During an annual service, the repair technician will also inspect your submersible pressure gauge and high-pressure hose, depth gauge, and compass for proper operation. Do not leave your gauges sitting in the sun. The sun can cause the oil in a compass or depth gauge to expand and leak. Also, if you will be traveling at high altitudes, be sure to transport your gauges in a pressure proof container when at more than 300 meters (1,000 feet) above sea level. Verify What You Have Learned Review the following questions about regulators, alternate air sources, and instrumentation: 7. The most important criteria when selecting a regulator is __________________ ___________________________. 8. You must replace the ______________ before you rinse your regulator. 9. What is an advantage to using an octopus regulator? _______________________________ 10. What is the primary advantage for using contingency scuba instead of an octopus regulator? _____________________________ 11. A ______________ depth gauge is usable only at shallow depths. 12. The __________________________ measures the air pressure in your cylinder. ADDITIONAL DIVING INSTRUMENTS Some additional diving instruments that you might want to consider using include a timing device, a computer, and backup instrumentation. Timing Devices Along with keeping track of your depth under water, you must also keep track of the time you stay under water. You can keep track of your time under FIGURE 2-30. YOU SHOULD RINSE YOUR REGULATOR AT THE END OF EACH DIVING DAY. water by using a watch, an underwater timer, or a dive computer (figure 2-31). Watches used for diving must be designed to withstand pressure. They should be rated for depths of at least 100 meters (300 feet). Your watch should also have a way to measure elapsed time with one of the following: • A rotating bezel around the dial of the watch. • A stopwatch feature. Underwater dive timers are designed to measure elapsed time and have a valuable feature not found in most dive watches. A pressure-activated switch starts the timer when you leave the surface and shuts off automatically when you come back to the surface. The dive timer automatically records the elapsed time of your dive without action on your part. With most watches, you must remember to set the recording mechanism at the start of the dive and check it at the end of the dive. Dive Computers Dive computers measure the length of your dive time as well as many other items. Computers are the
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