We are offering flue gas analyzer.flue gas analyzer operating temperature range 14 to 122f (-10 to 50c)battery rechargeable ni-mh, >6 hour lifecharger input voltage 115v or 230v : 50/60 hz acfuels natural gas, lpg, light oil, heavy oildisplay backlit1. Combustion efficiency analyzermeasure 0 and co 2calculate co , efficiency, excess air and ratio. 2will work with high efficiency furnaces, hot waterheaters, and other combustible gas appliances. 2. Combustible gas detectorset at 100 ppm sensitivity for natural gas 3. Co analyzermeasure 0-10, 000 ppm co 4. Differential thermometerdual input k-type thermocouple temperature tester 5. Differential digital manometerdual input differential manomoter with 3 selectable units of measure: kpa, mbar, inh2o technical specifications temperature measurementrange -40 to 1472f or -40 to 800cresolution 1f or caccuracy (k-type) 0.3%, 2f or 1c pressure measurementselectable ranges mbar, kpa, and inh2oranges -150 mbar to +150 mbar, -15 kpa to +15 kpa, -60 inh o to +60 in h2oresolution 0.01mbaraccuracy 0/5% fsd gross / net efficiencyrange 0 to 100%resolution 0.1% oxygen (o ) measurement 2range 0 to 25%resolution 0.1%accuracy 0.3% carbon monoxide (co) measurementrange 0 to 10, 000 ppmresolution 1 ppmaccuracy 5 ppm or 5%, whichever is greater carbon dioxide (co )range 0 to 25%resolution 0.1%accuracy calculated co/co2 ratio range 0 to 0.999resolution 0.001accuracy calculated