Vacuum Gauge, Precision, Rugged, Bluetooth, Wireless. This vacuum gauge features one-of-a-kind patented vacuum graphing. Use the graphing feature to pinpoint problems in real time (Leak, Pump, Outgas, Stable). Bluetooth Version offers the ability to link to your smartphone or tablet with the Vacuum Gauge app to wirelessly monitor, save and share your vacuum and pump down data. Features: Graphical display of vacuum pressure, Auto off, On/Off soft switch, Backlight for night viewing, Low battery indication, 70 hour battery life, Self-test mode, Field calibratable. Applications: Vacuum pump testing, Baseline vacuum pump performance, Transformer dryout, Schlenck line monitoring.