All the air gauges that are currently being used in any tire shops or garages are relative pressure gauges, which mean they are atmospheric dependent. ATEQ has developed a patented technology for it's TPMS Filling Gauge that when any mechanic is inflating any vehicles tire by using this tool, the pressure displayed in the gauge it is the same as the pressure that the TPMS sensor will be transmitting. Features include a fitted, oil-resistant rubber hose (length: 1.5m), powered by 2.15V AAA batteries, large LCD display, and displays pressure reading in psi, Kpa and bar.