The digital manometer shown is a handy, low cost meter to measure vacuum and pressure in the field and in the laboratory. The meter can be set to measure pressure and vacuum in 11 modes, from mm Hg to mbar or cm H2O.
Press the top left button to turn the unit on. The meter will shut off automatically approximately 20 minutes after every power on.
Press the button with the lightbulb, and the backlight is on for about 20 seconds.
Measurement units are set by pressing: UNIT.
To zero the display, disconnect the pressure/ vacuum lines, and then press HOLD for 3 seconds.