Bluetooth dual input differential manometer with a +/- 150 mbar input range. Operates with mbar inH2O, kPa, PSI, mmHg, inHg, and mmH20 units of measurement. Works in conjunction with the TPI View app to display and email results and to perform differential pressure measurements. Magnet on back for hands-free usage. Works with - iOS App - Android App Real-Time Read-Out Without Display Auto Power Off in 10 Minutes Measures Up To 2.18psi/0.15bar Pressure in psi, bar, kPa, mmHg, inHg, mmH2O & inH2O 1 Year Guarantee GPS Tagged Reports from App Works with - iOS App - Android App Real-Time Read-Out Without Display Auto Power Off in 10 Minutes Measures Up To 2.18psi/0.15bar Pressure in psi, bar, kPa, mmHg, inHg, mmH2O & inH2O 1 Year Guarantee GPS Tagged Reports from App