Instrument Test Chamber Our most popular pressure chamber for critical examination of all types of dive instruments features a newly improved DC-300C plated steel pressure vessel (10” ID x 11” inner height) mated with a 1.0” thick Plexiglas viewport affixed to a bayonet ring. This ring inserts into the pressure vessel, seals on a large 0-ring, and locks in place with a six pin & cog system. An inner water bucket allows the wet-testing of gauges against the Master Gauge calibrated in both feet (300) and meters (90) of seawater with an accuracy of better than one foot! Equipped with a unique bulkhead fitting, this apparatus can even check fully air-integrated dive computers, as well as sonarized types without hoses! Most depth gauges, watches, lights, and small cameras / strobes can also be evaluated. Delivery begins in late December or by requested scheduled shipment. It is specifically designed to test today's highly sophisticated dive instruments. It features a 4.5" Test Gauge with 1/4 of 1$ accuracy to 300 feet of salt water (that's 0.75 ft!) The gauge is calibrated in both feet (300) and meters (90) of depth and has an antiparallx mirror for obtaining highly accurate readings. Each unit is equipped with Bulkhead Air Shunt and Swivel as already described.