The PCL Air Technology MK3 Heavy Duty Inflator gauge has a lightweight aluminum body and an easy-to-read magnified linear scale. This tool allows users to inflate and deflate while staying engaged on the tire valve stem. Calibrate and certified 0-138 psi. All PCL tire inflation products are inspected 100 percent, and certified for accuracy of +/- 2 psi. All PCL products carry a full one year warranty against defects in material and workmanship.