The C50 and C75 combustion analyzers measure flue temperature and oxygen; the C75 also measures carbon monoxide (CO). Both of these analyzers calculate carbon dioxide, gross and net efficiency, and excess air, while the C75 also calculates CO free air. According to the manufacturer, the user can easily choose the desired combustion parameter with a multimeter-style rotary selector. According to the manufacturer, both models read preprogrammed fuels — natural gas, light oil, propane, butane, and LPG. The company says that the extra large backlit LCD displays two parameters at a time. The infrared printer ports allow for a technician to print test results to an optional printer.

UEI, 8030 Nimbus Ave., Beaverton, OR 97008; 800-547-5740;;

eProduct #188