The AccuGauge is a media isolated digital pressure gauge featuring multiple units, min/max readings, selectable tare/zero andautomatic power off to conserve battery power. A backlight provides improved visibility under marginal lighting conditions. The AccuGauge is compatible with any liquid or gas that is compatible with 17-4 PH stainless steel. Please consult our factory for other available materials. The pressure sensor is a one-piece high strength stainless steel design and contains no silicone oil, no welds and no internal O-rings.