The Astro Tool 3018GR Digital Tire Inflator w/ Stainless Steel Hose & Push-Lock Coupler Chuck ‐ Green is AAA battery powered with 4X the battery life and simplified battery installation. This tire inflator is designed with a 21”stainless braided hose with bend guard for increased durability, displays KGF, PSI or BAR measurement, and works with nitrogen systems and CO2.This tool uses maximum accuracy and 0.1psi resolution for use with TPMS (Tire Pressure Monitoring System) along with two positions - 1st position deflates and 2nd position inflates. In addition the 3018GR includes, a large face backlit LCD digital read-out, easy change chuck system, and the unit is covered with a rubber sleeve for extra comfort and durability.Measuring Range: 3 - 175psiUnits: PSI / BAR / KPA / KGFResolution: 0.1 PSIAccuracy: Compliance with European 86/217/EECand ANSI B40.10 - 58 psi +/- 1.2 psi59 - 174 psi +/- 2.0 psiWorking Temperature: 32°F - 104°F (=0°C - 40°C)Power: AAA BatteryBattery Lifetime 560hr