Branick Airhead BK4
The AirHead has a high strength aluminum body and is tough enough to withstand the abuse that is common in a shop. It has an easy to read magnified linear scale, which is in a sealed environment ensuring debris isn't going to affect the reading. You'll save time because you can inflate and deflate without removing the inflator from the valve stem. The AirHead is certified and calibrated to +/- 2 psi. There are several hose lengths and a variety of chuck styles to choose from.