Cheese, PressurePro sensors must be discarded once the battery is spent. The company does offer an exchange program to get a new sensor after trading in the old one. The reason I read for the permanently sealed sensor was more waterproof. Maybe so but replacing an entire set every few years takes a bite from the wallet, especially when compared to free batteries from TireMinder.
If these are going on a commercial vehicle that runs year in year out in fair and poor wet weather, it's probably easy to justify especially if they do in fact keep all water out. For most busnuts, travelling far fewer miles and mostly in fair weather, not sure if it makes sense; did not to me.
