Diving Gauges - Analog
Analog gauges consist of typically depth and dive pressure gauges in either single or console configurations. The depth gauge is a mechanical gauge that reads the depth by a needle indicator. Some scuba depth gauges have an option of a maximum depth indicator, which is a second needle that is moved up the depth scale by the main needle. As the main needle returns to zero it leaves the maximum depth indicator needle at the deepest depth obtained. The needle can be manually reset at the surface for the next dive. Depth gauges can come in either imperial or metric scales. The most common maximum depth rating is 150 feet / 50 meters. Pressure gauges are also mechanical gauges that read by a needle indicator. Most have a color coded dial face which makes reading the amount of pressure in the tank at a glance simple. Some gauges come with a high pressure hose and can be used with or without a protective boot or console. Some are designed to thread directly into the high pressure port of a first stage regulator for use with a pony bottle system. Other models include a temperature gauge. Analog gauges can come in either imperial or metric scales. The most common maximum pressure rating is 5000 psi / 300 bar. Gauges can be rated for air, nitrox 40% or even 100% oxygen use.