Digital Vacuum Gauge Specification Model VMV-1 Maximum Overload Pressure 14psi/0.1Mpa Resolution 0.01 (<10pa), 0.0001 (<10mbar), 0.0001 (<10mmhg), 1(<30000 Micron) Measurement Accuracy 2-100Pa (Digits ± 5%) Operating Temperature 0-50°C(32-122℉) Units Pa, mBar, mmhg, Microns Refresh Rate 0.5 Seconds Interface 1 * 7/16-20UNF Sensor 1 * Pirani Sensor Automatic Shutdown 10 Minutes Backlight 20 Seconds Beep Horn 90 DB(closes after 10 seconds) Weight Approx. 409g / 14.4oz Size Approx. 14.5 * 6 * 3cm / 5.7 * 2.4 * 1.2in Suitable for atmospheric environment(cannot be used for measurement in other environments such as refrigerants) Battery Powered The vacuum meter is powered by 3 AA batteries(Battery is not included), easy and convenient to use. Easy to Carry Compact and lightweight,vacuum tester comes with a storage bag for carrying.