Features: High stability chip, built-in 32-bit digital processing unit and high-accurate data acquisition unit, for more stable and accurate pressure data measurement. Double pressure testing, real-time vacuum degree and pressure values, provide reliable basis for judging the operating condition of refrigeration systems. Built in with 92 types of refrigerants 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, The better the refrigeration capacity of the refrigeration systems. The greater the degree of super heat, the smaller the opening of the expansion valves (less refrigerants charge) can be determinedly. Foldable hook design for convenient carrying and storage. Built-in brass valves, spherical structure, and strong sealing performances. Specifications: Component:Plastic+Metal Size: Approx.166x113x64mm/6.54x4.45x2.52inch Type: Set A Pressure testing range: 0-6000 Kpa Pressure testing resolution: 1Kpa Pressure overload limit: 10000Kpa(10Mpa, 100bar) Vacuum degree testing range: -101 to 0Kpa Vacuum degree testing resolution: 1Kpa Battery: 3xAA battery (not included) Application Scenarios： 1.A/C installation and maintenance 2.Refrigerator maintenance 3.Cold storage inspection Package Includes: 1 Set Vacuum Pressure Gauge note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.