It features 11 selectable units of measure: in H2O,psi,bar,mbar,Kpa,InHg,mmHg,ozin2,FtH2O, ... from -55H2O to +55H2O(+2 psi).It features 11 selectable units of measure: in H2O,psi,bar,mbar,Kpa,InHg,mmHg,ozin2,FtH2O ... Hold and Auto Power off disabled.Careful use of this meter will provide years of reliable service.2.Specification:Display: Dual LCDAccuracy ...