Brand : TPI, USA Model : TPI 621 Measurement Range : ±120” H2O Input Type : Dual Differential (1/4” Barbed) Resolution (max) : 0.01” H2O Accuracy : +/-(0.5% of reading + 5 digits) Units : mbar, kPa, PSI, mmHg, inHg, mmH2O, inH2O