Accuracy + -, 50 to Microns . + - 0.02 Inch WC on 0 Inch WC to ±2 Inch WC, + - 1.5 Percent FS on 2 to + - Inch WC . + - Percent . + - Percent . + -20 Percent . + -3 Percent . -32 to 149 Deg F . Percent ...