Stay alert with the Carbon Monoxide Meter. With a Digital LCD display and an auto/manual zero, the meter does fast sampling and max hold, data hold. The auto power off and 3-year sensor life provide additional convenience for users. With a 200 ppm safety alarm that sounds continuously, the monitor has a 0degC - 50degC operating temperature and a 0 - 1,000 ppm measurement range. With a+/- 15% or +/- 10 ppm accuracy, the monitor includes a stabilized Electrochemical Gas-Specific sensor and a 9V battery.