
Correct tire pressure is crucial. I keep a pocket watch in every car and a dial gauge next to my compressor. I recently checked the pressure on one of my machines and my pocket gauge showed one pressure and my dial indicator a second pressure - about a 5# difference. For the ideal 32#, this is a significant difference. So I decided on this duo of digital measuring devices. Now one is in my main car and the second one stays in my tool box.