Extech CO270 Battery Operated Air Quality CO2 Meter

BATTERY LIFE: Battery life is 6 months or 1 year in ECO mode RECALL TIME: Recall peak and average value over the last 24-hour period ANTI-FEATURES: Includes anti-theft and anti-modification features BUZZER: Programmable buzzer features to alert when set threshold is exceeded CALIBRATION: CO2 manual calibration feature