Klein's Carbon Monoxide Detector w/ Carry Pouch combines practical measurement functions with a compact design suited to jobsite use. MAX/AVG, HOLD, MUTE, and SET functions help technicians evaluate readings, retain displayed measurements, silence alerts, and perform calibration-related tasks. Auto-power-off after 20 minutes helps conserve battery life, and the included carrying pouch and four AAA batteries make the meter ready for field use. A durable housing provides 3.3 ft. drop protection, while the unit remains a measurement tool rather than personal protective equipment