Dual port, high resolution, fast response digital vacuum gauge now with convenient magnetic HVAC strap. Reads vacuum in seven international units Magnetic strap Ultra fine resolution Auto shut-off Display updates every 1/2 second Convenient built-in hanger Easy to clean sensor (use isopropyl alcohol) Low battery indicator SPECIFICATION Operating pressure range 0-12,000 microns Resolution 1 micron when vacuum is less than or equal to 200 microns Sensor type Thermistor Accuracy +/- 10% (100-1000 microns) Units Microns, mbar, Pa, Torr, mTorr, psi, inHG Operating temperature range 35°F to 125°F (2°C to 52°C) Maximum overpressure 500 psi (34 Bar) Connector type Standard 1/4” male flared fitting Power Source 9 V battery (not included) Battery life 40 hours Auto shut off After 10 Minutes when vacuum reading is above 12,000 microns (12 Torr)