TPI 621 Manometer Pressure features
Dual input with +/-120 inch H2O range. 0.001 inch H2O maximum resolution. Seven units of measure (mbar, kPa, PSI, mmHg, inHg, mmH2O, inH2O).
Display - 5 digit with backlight. Smooth - Stabilizes display when measuring fluctuating pressures. Auto Off - Conserve battery power.