My AstroAI digital tire pressure sensor stopped working about 6 months after purchase. I opened the device and found a CR2032 battery and three LR44 batteries. I thought the batteries were dead so I checked each one with a multimeter. All LR44 batteries showed a voltage of 1.49-1.51 volts and CR2032 - 3.02 volts. I don't have the opportunity to test the batteries under load, so it's possible they're close to exhaustion, but ordering replacement batteries is costing me more than buying a new gauge(!). After removing and reinserting the batteries, the sensor works again for the rest of the day and then stops working again after an overnight downtime. So at this point I don't know if the batteries or the sensor itself is to blame. Anyway, I'm not satisfied with that. This sensor stopped working when I needed it most. It was good while he was working, but I can't trust him anymore. My next sensor will be a mechanical one.