Fast and easy set-up. Fast purge and fuel selection during start-up reduces set-up time. Measures CO, O2, pressure, and temperature. Calculates CO2 and gross ornet efficiency. Works on high efficiency furnace. Selectable fuels: natural gas, light oil, heavy oil, LPG, bituminous coal, anthracite coal, coke, butane, wood, bagasse. Pump driven for fast response. Dual input differential manometer with 3 selectable units of measure: kPa, mBar, in H2O, 0.001 in H20 resolution. Tightness test: check for pressure leaks in valves, fittings, and switches with an elapsed time reference. Flue probe with built-in thermocouple. IR printer port - use optional A740 Infrared Printer. Soft carrying case. Protective rubber boot. Operating temperature range: 14 to 122 degree F. Charger input voltage: 115V or 230V, 50/60 Hz AC. Data storage: 10 sets of readings. Data logging: 400 sets of readings. Single logging: 150 sets of readings. Time and date: 24 hour real time clock. Carbon monoxide (CO) measurement: range: 0 to 10,000 ppm, resolution: 1 ppm, accuracy: +/-5ppm or 5 percent of reading whichever is greater. Oxygen (O2) measurement: Range: 0 to 25percent, Resolution: 0.1percent, Accuracy: +/-0.3percent. Carbon dioxide (CO2): Range: 0 to 25percent, Resolution: 0.1percent, Accuracy: Calculated. Temperature measurement: Range: -40 to 1472 degree F, or -40 to 800 degree C, Resolution: 1 degree F or degree C, Accuracy (K-type): +/-0.3percent, +/-2 degree F or +/-1 degree C. Draft/pressure measurement: Selectable Ranges mBar, kPa, and inH2O: Ranges: -150 mBar to +150 mBar, -15 kPa to +15 kPa, -60 inH2O to +60 in H20, Resolution 0.01mBar, Accuracy: +/-0/5percent fsd. Gross/net efficiency: Range: 0 to 100percent, Resolution: 0.1percent, Accuracy: Calculated. CO/CO2 ratio: Range: 0 to 0.999, Resolution: 0.001, Accuracy: Calculated. Combustible Gas level indication for flue gasses. RoHS Compliant. Measures 90mm width by 200mm height by 60mm depth.