The DiveMed(TM) M300 is a breakthrough in solid state gauge design. Its sensing element incorporates a semi conductor strain gauge pressure transducer. The internal mechanisms of the M300 are manufactured of stainless steel.Pressure range 0-225 FSW Standard. The gauge is powered by a 9 volt alkaline battery which is user replacable. 4 Digit LCD display. The gauge provides +/- 0.25% full scale accuracy. The easy to read 0.5 inch character display allow it to replace much larger machanical gauges.