Differential Pressure Manometers features:1. 11 Selectable units of Measure2. Max / minimum / average, and with a relative time3. Large LCD backlit dual display 4. Zeroing, offset, and data compensation6. Low battery display and automatic shutdown7. Data Hold and Error codeDifferential Pressure Manometers specifications:unit ET-920 ET-921 ET-923rangeresolutionrangeresolutionrangeresolutioninH2O±55.400.01±1380.1±415.20.1Psi±2.0000.001±5.0000.001±15.000.01Mbar±137.80.1±344.70.1±10341KPa±13.790.01±34.470.01±103.40.1inHg±0.4070.001±1.0180.001±30.540.01mmHg±103.40.1±258.50.1±775.70.1ozin²±32.000..01±801±240.00.1ftH2O±4.6120.001±11.530.01±34.600.01cmH2O±140.60.1±351.50.1±10551kgcm²±0.1400.001±0.3510.001±1.0550.001bar±0.1370.001±0.3440.001±1.0340.001Maximum Pressure 10 psi20 psi100 psiAccuracy±0.3%FSLinearity/Hysteresis±0.1%FSRepeatability±0.25%FSInput portsTwo metal 4.5mm barbed for 1/8〞(3.18mm)ID tubingWorking temperature0～40℃/32～104℉Storage temperature-10～60℃/14～140℉Overrange indicationERR1 or ERR2Power supply9V batteryDifferential Pressure Manometers pictures:Recommendations:Pocket IR ThermometersMini Pocket Temperature And Humidity MeterPocket Light Lux Meter Price