Vacuum Gauge, Precision, Rugged, NON-Bluetooth Version. 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). 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.