HVAC DIGITAL VACUUM GAUGE - Digital vacuum gauge can measure the real-time pressure during vacuuming of the refrigeration system, suitable for dynamic monitoring of vacuum pressure changes in HVAC and heat pump systems. It can be used in conjunction with a vacuum pump to measure the real-time pressure during vacuuming, quickly and accurately judge the degree of dehumidification and impurity removal, and detection the vacuum system and refrigeration systemin real time. PARAMETERS - Maximum overload pressure of vacuum gauge: 72psi or 0.5Mpa Accuracy: 0.1-1000Pa (digital 5 percent ) Resolution: 0.01(Less than 10 Pa) Operating temperature: -23-122 Connection:7 or 16inch-20UNF(1 or 4inch SAE). Digital HVAC vacuum gauge uses pirani vacuum sensor, which can respond quickly and accurately measure micro-pressure changes in vacuum. MONITORING MODE BUZZER PROMPTER - The vacuum gauge defaults to the normal mode after it is turned on. Press