Review on Portable Air Compressor Tire Inflator with Digital Pressure Gauge and LED Light - 150PSI, 12V DC Auto Tire Pump for Car, Bicycle, and More by Major Callaham

I don't write many reviews. I bought this for my wife to easily inflate her tires on her car. PROS: Compact Very easy to use CONS: 1) Gauge is wide and inconsistent. Each tire was found to be 2+ PSI higher than stated on it. One wheel was set at 33psi but the pump inflated it to 37.5psi and my wife shut it off when it continued to run above the 33psi setting. 2) The device does not switch off at the desired pressure. We let two tires run to a standstill, we stop two manually. The two we turned off were automatically above the set pressure, the two we manually turned off were caused by the continued exceeding the set pressure. We will continue to use it but now I need to buy a separate pressure gauge in the tires so the tires can be checked after using this pump.