I have a good air compressor and I always check the air pressure in our cars and on my tractor. I wanted a tire inflator with a built in pressure gauge and wasn't impressed with the round dials so I bought this. It is solidly made and of very good quality. The device has a double chuck to attach the compressor to the air nozzle of your tire. It has a liquid filled pressure gauge which in my case was accurate to 1 PSIG. I have checked the accuracy with a good quality digital tire pressure gauge and also with the digital tire pressure gauges on my vehicles dash with two different vehicles. All three sources agreed on the tire pressure. The scale of this indicator is calibrated in 2psi increments. The tire inflation lever is easy to use and speeds up the inflation process enormously with this combination of tire inflator and pressure gauge. My only issue is that the unit didn't come with a quick disconnect, which I had to pick up at the hardware store for less than a dollar. I spent more on gas to get there than the cost of the part. I like the quality of this device and I recommend it. It's accurate and speeds things up when you're in a hurry. This device is also similar to Milton's and has an identical design. The Milton nozzle is brass but this EPauto version is chrome plated. It's good quality and I would buy another one. 10 months later and still works great. These are exactly the same models that are used at gas stations. It's quick and easy to use. This is one of the best investments I've made for my garage and I wish I had bought it a long time ago just because it saves me time. I like to just turn on the compressor and not have to look up tire pressure. Pressure gauge and tire nozzle for the compressor. I've found this to be very helpful this winter as tire pressures keep dropping due to very cold temperatures. I have found that I need to inflate my tires several times a month and this tool makes it easy. The presence of a built-in pressure gauge with easy-to-use controls makes it quick and easy to inflate tires.