A tire pressure gauge isan essential part of keeping your tires atthe optimum pressure.
Probably using your hand to squeezethe tire will help you determine what the right tire pressure feels like sothat you do not have to rely so much onthe tire pressure gauge .Actually,but I think the thing in myhand is called a "tire pressure gauge".
It is worth Investing a few dollars in a good dial-type tire pressure gauge anduse it to check your tire pressure once a week.
It is best to use the sametire pressure gauge and pump when you check your tires,
Becauseyou may get different readings dependingupon the tire pressure gauge that you choose.