Battery: 4 x AA Cells – alkaline preferred Handy and tough case, complete of filters and cells. Handheld instrument for the measuring of the values of Biossido di carbonio (carbon dioxide, CO) from 0 to 2000 ppm. Simply calibration with automatic zero on switch on. Accuracy: +/- 10% with infra-red sensor, fit for air quality. Complete of stiff probe in stainless steel SGAFP and protective rubber sleeve and aluminium handle (325 mm) tough case in ABS.