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 and BUZZER PROMPTER - The vacuum gauge defaults to the normal mode after it is turned on. Press "SET" button to active target vacuum set montioring mode. After target vacuum is set, press "SAVE CAL" to save and active monito mode, buzzer beeps periodic. When vacuum pressure reached set pressure,alert will be activated (screeflicker,buzzer beeps), press any key to quit alert or wait 35 seconds,alewill stop automatically. SUPPORTS 6 UNITS and DISPLAY BACKLIT - Rogvoc digital vacuum gauge supports 6 type pressure units: Pa, mBar, mmHg, Microns, mTorr, ImHg. Vacuum gauge tester with a large backlit display for clear readings even in dark environments. The anti-slip rubber on both sides of the vacuum gauge and the easy-to-carry tool bag provide great convenience for work. Packing includes: digital vacuum gauge x 1, portable tool bag x 1, AA batteries x 3, extension connector x 1 and English user manual. Colour:As Shown Material:Plastic Package Contents: 1 x Digital Vacuum -Meter kit 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.