Meiser Presta-Valve Dial Gauge with Pressure Relief: 60psi For Presta valves only. - Does NOT work with Schrader valves common on cars and ATVs. Unlike digital gauges, the Bronze Bourdon tube precision movement is not affected by temperature, altitude, or humidity, and no batteries are required. Accuracy conforms to ANSI B40.1 Grade B and California regulation. Gauge holds pressure reading until released. Bleeder button releases pressure reading / bleeds air from tire. Compact design fits easily into handlebar or seat packs