3 The limit pressure is 10 Mpa (100 bar). Also for DY517A, if the packed. Refrigerant digital hvac manifold gauge set vacuum pressure temp diagnostic tool the instrument uses high-strength engineering plastics and flexible non-slip silicone design. The instrument can measure double pressure (gauge pressure) at the same time, as well as dual temperature measurement, with automatic multi-unit pressure conversion, automatic conversion of temperature Celsius / Fahrenheit, to facilitate different needs.