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Since 1910, General Tools has grown to become the recognized industry leader for specialty hand tools and instruments. The battery operated DCO 1001 features an electrochemical CO sensor with 3 points of auto calibration: 0, 100 and 500 ppm. The meter has a Backlit LCD Display and simultaneously exhibits Dual Readings of the current CO level and the maximum level since the meter was powered on, updated every second. Other features include automatic calibration to 0 ppm in fresh air and an audio alarm that can be set to sound whenever the CO level exceeds any of eight selectable levels, to indicate a dangerous CO concentration. It has a measuring range of 0-1000 ppm and comes complete with a soft case, a wrist strap, 3 AAA batteries and an instruction manual. Ideal for HVAC contractors, Plant Operators, Automotive experts and other professionals to detect dangerous carbon dioxide buildup.