Extech CO50 Carbon Monoxide Meter also features an additional loud audible beeper alarm, electrochemical CO sensor, record/recall Max reading for CO concentration and CO calibration function in fresh air.
Features:
At the same time displays Carbon Monoxide (CO) concentration, Air Temperature, and Relative Humidity readings with date (Year, Month, Day) and time
Visibly bright LED demonstrates active monitoring (green) or surpassed CO alarm threshold (red)
Additional loud audible beeper alarm level meets UL 2013 Standard (>85dB @ 3 meters); default alarm threshold at 30ppm (user adjustable)
Designed with Electrochemical Carbon Monoxide sensor
Record/Recall Max reading for CO concentration
CO calibration function in9(Nine) readings with recall function
Complete with Universal AC adapter (100V-240V) and multiple plug types (US, EU, UK, AUS)

Extech CO50 Carbon Monoxide Meter also features an additional loud audible beeper alarm, electrochemical CO sensor, record/recall Max reading for CO concentration and CO calibration function in fresh air.
Features:
At the same time displays Carbon Monoxide (CO) concentration, Air Temperature, and Relative Humidity readings with date (Year, Month, Day) and time
Visibly bright LED demonstrates active monitoring (green) or surpassed CO alarm threshold (red)
Additional loud audible beeper alarm level meets UL 2013 Standard (>85dB @ 3 meters); default alarm threshold at 30ppm (user adjustable)
Designed with Electrochemical Carbon Monoxide sensor
Record/Recall Max reading for CO concentration
CO calibration function in9(Nine) readings with recall function
Complete with Universal AC adapter (100V-240V) and multiple plug types (US, EU, UK, AUS)