Automatic calculation of superheat subcooling Temperature and pressure compensation Vacuum measurement Automatic power off Pressure zeroing All measurement data are displayed Built-in 88 kinds of refrigerants (including new flammable refrigerant) Compatible with A2L refrigerant Flammable refrigerant flame flashing reminder 6 pressure units:psi,bar,kg/cm²,inHg,kPa,MPa Pressure range: -14.5~800psi, accuracy: ±0.5% 2 temperature units: °C , °F Temperature measurement accuracy ：±0.5°C Waterproof rating IP54