The inst ent can measure double pressure (gauge pressure) at the same time, as well as dual temperature measurement (need test clip,not include), with automatic multi-unit pressure conversion, automatic conversion of temperature Celsius / Fahrenheit, to facilitate different needs. Built-in 89 kinds of refrigerant pressure-evaporation temperature database, also calculate the subcooling superheat, to facilitate direct reading of operating process data. Also it tests percentage of vacuum measurement; pressure leak measurement, leak time speed record. It is deserved to have this multi-functional, accurate and simply operated digital manifold let you do the job right. EC/EN61010-1 safety standards for design and production. 1) The pressure measured by the digtal manifold pressure tester is gauge pressure. Pressure testing ranges from -101Kpa to 6Mpa (-0.1bar to 60bar). 2) The limit pressure is 10 Mpa (100 bar). The maximum operating pressure of standard hose is 600 PSI ( approximate 4.13 Mpa, 41.3 bar ). The limit pressure is 3000 PSI approximate 20.68 Mpa, 206.8 bar ). 3) Please confirm the rated pressure value of the tested equipment before testing. Do not use it if it exceeds the range of the inst ent. Also for DY517A, if the packed.hoses does not match the pressure requirement, you can use suitable replacements for testing. 4) Do not use and store the inst ent in high temperature, high humidity, , and strong electromagnetic fields.Please do not change the inst ent internal circuit, to avoid any damage of the inst ent or danger occurring. 5) Please wear qualified to protect user during testing. Please use the inst ent in a well-ventilated environment to prevent inhalation of gases. Colour:Gray black Material:ABS Power Supply: 3*AA battery,Battery not included size:170x110x50mm style: with Clip Package Contents: 1 x Refrigerantion Digital Manifold Gauge 2 x clip 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.