The sensor is accurate when it works. Very disappointed in this sensor and for the price I paid for it I was expecting a MUCH better quality product! First problem When installing batteries, there is no diagram on the cover or in the instructions how to install. I finally found out. 2. When I take a reading and deflate the tire it sometimes reads higher than when I started and I have to loosen the tire valve, deflate the tube and restart. I'm a drag racer and tire pressure is crucial. My team keeps complaining that the sensor won't turn on because the battery cover screw comes loose and we have to remove the rubber boot and tighten the battery cover screw.