Specification Carbon Monoxide Meter GM8805 Gas Tested CO in the Air Measuring Range 0 - 1000 ppm Resolution 1 ppm Minimum Reading 1 ppm Accuracy 5% (f.s) or 10 ppm Response Time 60 seconds Sensor Type Electrochemical CO Sensor Buzzer Alarm Setup Set Up and Review the Upper and Lower Alarm Limit MAX, AVG, Data Hold Auto Power Off Low Battery Indication Operating Environment %RH Storage Environment -1%RH Unit Size 55.7 x 22.9 x 135.5mm Power 2 x 1.5V AAA batteries