Do not buy this tire pressure gauge because you cannot rely on it to provide accurate tire pressure readings compared to calibrated gauges. The tire pressure sensor gave good pressure readings for about 3 months, and then the low tire pressure resulted in over-inflation and excessive tire wear. This problem was discovered when measuring tread depth. It cost me about $600 extra tires on a hot truck. Stick to quality mechanical gauges that are easy to use and don't require batteries.