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High efficiency gas and oil fired furnaces along with condensing boilers require a manometer with 0.001 inches of water resolution to make proper adjustments. 0.001 inH2O resolution at less than 40 inH2O; 0.01 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. Auto power off after 20 minutes. +/- 0.2 percent accuracy. 300mbar over pressure. 32 to 104 degree F operating temperature. RoHS compliant.