Reed Instruments Carbon Monoxide Monitor with Temperature & Humidity , 0 - 999 ppm, 10 ppm ± (R9450)

Carbon Monoxide Monitor with Temperature & Humidity Measures carbon monoxide (CO), air temperature and relative humidityFeatures a large LCD display, built-in clock and calendar, max hold function and user-adjustable alarm limitCan be mounted on a wall or placed on desktopManual CO calibration to zeroLow battery indicatorIncludes: Desktop Carbon Monoxide (CO) monitor with temperature & humidity, Batteries