11 selectable units of pressure Gauge/differential pressure Auto power off 11 Selectable Units of Measure (in H2O, Psi, Mbar, Bar, kPa, inHg, mmHg, Ozin2, ftH2O, cmH2O, KgCm) - Data Hold and Error Code - Response Time: 0.5 Sec Display Max, Min, Average, with Relative Time - Accuracy: +/- 0.3% FSO (25 C) - Power Supply: 9V Battery (Included).