With 11 different units of measure the Pyle PDMM01 Manometer is light weight and easy to use and measures pressure accurately. It can measure in 11 different units, including in H2O, Psi, Mbar, Bar, kPa, inHg, mmHg, Ozin2, ftH2O, cmH2O, and KgCm. Displays maximum, minimum, average, all with relative time, on the large backlit LCD dual display. Data hold and error code keep you on top of your data.