Application scope: installation and maintenance of AirConditioning, daily maintenance of refrigerators, daily inspections of freezers, maintenance of automotive AirConditioning, etc. Features: Metal interface, made of metal material that meets interface standards, wear-resistant and corrosion-resistant. High stability chip, built-in 32-bit digital processing unit and high-accurate data acquisition unit, for more stable and accurate pressure data measurement. Dual pressure testing, real-time vacuum degree and pressure values, provides reliable basis for judging the operating status of refrigeration systems. Built in with 92 types of refrigerant NIST, powerful computing power, it can switch between common refrigerants at will, suitable for various maintenance situations; Intelligent diagnostic system malfunction. Recordable leakage time and speed, easy to operate, and direct reading of process data. Evaporation temperature/condensation temperature display. The greater the degree of subcooling, TheBetter the refrigeration capacity of the refrigeration system. The greater the degree of superheat, the smaller the opening of the expansion valves (less RefrigerantCharge) can be determined. Foldable hook design for convenient carrying and storage. Built-in brass valves, spherical structure, and strong sealing performances. Specifications: Type: Set A, Set B (optional) Pressure testing unit: Kpa, Mpa, bar, inHg, PSI Pressure testing range: 0-6000 Kpa Pressure testing resolution: 1Kpa Pressure testing accurancy: ±0.5%(FS)+5dgt Pressure overload limit: 10000Kpa(10Mpa, 100bar) Vacuum degree testing unit: Kpa, Mpa, bar, inHg, PSI Vacuum degree testing range: -101 to 0Kpa Vacuum degree testing resolution: 1Kpa Battery: 3 AA battery (not included) Item size: 165 110 60mm / 6.5 4.3 2.4in Package size: Set A: 190 160 80mm / 7.5 6.3 3.1in Set B: 278 250 100mm / 10.9 9.8 3.9in Package weight: Set A: 900g / 2.0lb Set B: 2800g / 6.2lb Packing List: Set A: 1 Pressure Gauge Set B: 1 Pressure Gauge 2 Connector 1 Bottle Opener 1 Hose 1 Wrench 1 Storage Box.