Excellent pressure gauge! I am very happy with how it has worked so far. Reads exactly like 3 other sensors, both digital and old mechanical. The brightly backlit dial is very useful in the dark. I wish it was easier to lock it in PSI as it's easy to accidentally switch it to other units. You can read after reading without waiting 30 seconds or turning it off. Lightweight and also suitable for large hands. As for turning it off. You can wait 30 seconds for the auto power off - OR - press and hold the trigger button for 10 seconds. This will disable it if necessary. I will buy more for other cars.