Pressure reading is abnormal. Have contacted the seller. Gave me some information quickly to make sure I understood how to use the device. Came back to make sure I'm doing everything right. Still the same problem. I checked tire pressure with two other gauges, both reading 41psi. Jaco's meter read 32, 36, 38, 33, 30. Some air escaped so I checked with another gauge and it read 40. Not only is Jaco inaccurate, it's also inconsistent. release some air. Not that convenient, but it works