Combining unmatched performance with ultimate productivity, The Vacuum Sentry (V640 Series) guards system service activity and provides notification when pre-set alarm thresholds are reached. The VG640 with local audible and visual alarms. Radio Frequency (RF). Auto Shut Off. Built-in Hanger. One Year Warranty. Applications: Vacuum Measurements During System Evacuation, Measurements to Confirm System Leaks, High Precision Laboratory Tests. Sensor Type: Thermistor. Connector Type: Standard 1/4 inch male flare fitting. Vacuum Range: 0 - 19000 Micron (0 - 2600 Pascal). Resolution: 0-140: 0.5 Micron, 140-400: 1 Micron, 400-800: 2 Micron, 800-2000: 5 Micron, 2000-6000: 20 Micron, 6000-9000: 100 Micron, 6000-16000: 200 Micron, 16000-19000: 1000 Micron. Units: Micron, milliBar, Pascal, Torr, milliTorr. Accuracy: +/-10 percent or +/-10 Micron, whichever is larger (50 to 2000 Microns) at 75 degree F. Update Rate: 0.5 second. Alarm: Audible and visual alarm for high and low vacuum. Remote Alarm: (R100) Up to 400 feet remote audible, visual and vibrating alarm for high and low vacuum. Alarm Volume: 87 dB for both unit and remote. Operating Temperature Range: 0 degree F to 150 degree F ( -17 degree C to 65 degree C). Overpressure: 800 PSI max (55 Bar). Power Source: 3 AA Batteries. Battery Life: 600 Hours continuous usage, with battery indicator. Auto Shutoff: 8 hours when alarms are active. When alarms are disabled: 10 minutes when vacuum reading is above 19000 Microns, 1 hour when vacuum reading is below 19000 Microns. Weight: 6 oz. Measures 2-3/4" width 5-1/2" height by 1-1/2" depth; 1 year warranty.