Well, after 2 months of ownership and only a few uses, the sensor is defective! When the tire is full the gauge will read an incorrect psi pressure and after the tire is full the gauge will read either a low or a higher psi pressure. I ride motorcycles where the pressure is critical. So if your life is at stake I would not recommend this sensor. Seems to be of good quality material but after 2 months and a couple of uses it doesn't work. I've tried replacing the batteries and it still doesn't read properly. Also, you can only return after 1 month. It seems like a very short period of time since I don't check my blood pressure every day. I would like the supplier to replace this unit as it appears to be excellent value for money but I think you pay for what you get!