HVAC DIGITAL VACUUM GAUGE - This digital vacuum gauge measures real-time pressure during evacuation of refrigeration systems, ideal for monitoring vacuum pressure changes in HVAC and heat pump systems. It can be used with a vacuum pump to accurately assess the level of dehydration and contaminant removal, enabling real-time diagnostics of vacuum and refrigeration systems. PARAMETERS - Maximum overload pressure: 72 psi (0.5 MPa); Accuracy: 5% of reading from 0.1 to 1000 Pa; Resolution: 0.01 Pa (below 10 Pa); Operating temperature range: -23C to 50C; Connection type: 7/16"-20 UNF (1/4" SAE). Equipped with a Pirani vacuum sensor for fast response and precise measurement of low-pressure variations. MONITORING MODE & BUZZER ALERT - The gauge powers on in standard mode. Press the "SET" button to activate target vacuum monitoring mode. After setting the desired vacuum level, press "SAVE CAL" to save and enable monitoring. The buzzer will beep periodically. When the set vacuum level is reached, an alert activates with screen flash and audible buzzer. Press any key to dismiss the alert or wait 35 seconds for it to stop automatically. SIX MEASUREMENT UNITS & BACKLIT DISPLAY - Supports six pressure units: Pa, mBar, mmHg, Microns, mTorr, and inHg. Features a large backlit LCD screen for clear visibility in low-light conditions. Anti-slip rubber casing ensures secure handling. Includes a convenient carrying tool bag for easy transport and storage. PACKAGE CONTENTS: 1 x Digital Vacuum Gauge, 1 x Portable Tool Bag, 3 x AA Batteries, 1 x Extension Connector, 1 x English User Manual. Color: As shown Material: Plastic Note: Lighting effects and display settings may cause slight color variations between the product image and actual item. Dimensional variations of 1-3 cm may occur due to manual measurement. Sold by YJL official store