Replace a malfunctioning or broken spring or dial gauge on an air line or inflator with the STEELMAN 97982 High Accuracy Air Pressure gauge. Capable of displaying air pressure on it's 2.6-inch face in PSI, Bar, kPa, or kg(f)/cm2 this gauge has a built-in backlight for its digital LCD screen. This gauge can accurately read air pressures from 0-100 PSI with an error range of +/-0.25 PSI. A customizable automatic shutoff timer lets you determine how long before the unit shuts off. A protective rubber boot covers the gauge and protects it against accidental bumps and impacts. The gauge is powered by a single 9V alkaline battery which provides a 48-hour continuous runtime on a single battery (13-hours if the backlight is also continuously in use). 1/4" NPS Threads are allow connection with most standard connections for this size gauge.