TPI 621 Dual Differential Input Manometer, 5 Digit LcD, +-05 percent Accuracy, 001 H2O Resolution, +-120 H2O Range

High efficiency gas and oil fired furnaces along with condensing boilers require a manometer with 0001 inches of water resolution to make proper adjustments 0001 inH2O resolution at less than 40 inH2O 001 inH2O resolution over 40 inH2O Temperature compensated to ensure repeatable measurements Seven units of pressure: inH2O, mbar, KPa, PSI, mmH2O, mmHg, Trim mode to stabilize readings