The current industry standard for testing the water-tight integrity, accuracy, and overall function of depth gauges, watches, dive computers, and certain underwater photographic gear. Each chamber is constructed with a rugged steel structure. The cogged lid with clear acrylic lens is designed for strength and ease of operation. Standard “Depth” chambers have gauges with 1% accuracy. While, “Instrument” chambers have high accuracy, 0.25% accuracy gauges. The Depth Test Chamber is primarily intended for evaluating equipment for water-tightness and pressure resistance. It can also be used for testing conventional analog instrumentation, but its master gauge is NOT accurate enough to match that of the newest generation of electronic dive gauges and dive computers. The 4.5" master gauge goes to 230 ft. of water depth with an accuracy of 1% (2.3 ft). The Bulkhead Air Shunt is present in the body, but its inner port is plugged. The internal swivel can be added if desired.