As it's a fob, you have no excuse for failing to check your tyre pressures! Dangling from your keys, it serves as a constant reminder. As well as being simple to use, Accutire's gauge has a handy automatic on/off function. It coped well with the drop test, too, which is good, as the fob will be bashed about in your pocket. It was hard to slot home first time though, so we lost some pressure by trying to get a reading