Manometer 11 Unit of Pressure - Meters Digital Measurement Maximum 10 PSI Data Hold & Error Code Measure Gauge Differential Gas Tester - Large LCD Backlit Dual Display w/Auto Power Off - PYLE PDMM01 11 SELECTABLE UNITS OF PRESSURE: Used for measuring differential, positive and negative pressure. 11 selectable units are in H2O, Psi, Mbar, Bar, kPa, inHg, mmHg, Ozin2, ftH2O, cmH2O and KgCm AUTO POWER OFF: It features automatic shutdown when device display low battery. The power supply comes from the 9V battery that is included when purchased. Also, 2 soft hoses included LARGE LCD: It has a large LCD backlit dual display, so it works great even in poor lighting condition. Display max, min, average, with relative time. In addition, the manometer dimension is at 6.69 x 2.17 x 1.30 at 5.82 oz perfect to carry around DATA HOLD AND ERROR CODE: Quick response time at a split 0.5 second only. Accuracy: +/- 0.3% FSO (25 C). Repeatability: +/- 0.2% (Max +/- 0.5% FSO). Linearity/Hysteresis: +/- 0.29% FSO WORRY-FREE SHOPPING: With the Pyle PDMM01, we are confident of the quality of our product