REED R9450 Carbon Monoxide Monitor with Temperature and Humidity


This carbon monoxide meter is capable of detecting concentrations up to 999ppm. The R9450 features a large LCD display, built-in clock and calendar, max hold function and user adjustable alarm limit.


  • Measures carbon monoxide (CO), air temperature and relative humidity
  • User adjustable alarm limit
  • Built-in clock and calendar
  • Max hold function
  • Can be mounted on a wall or placed on desktop
  • Manual CO calibration to zero
  • Low battery indicator


Measuring Range 0 to 999 ppm
Accuracy ±5% of reading or ±10 ppm
Resolution 1 ppm
Sensor Type Stabilized electrochemical sensor
Measuring Range 32 to 122°F (0 to 50°C)
Accuracy ±1.2°F (0.6°C)
Resolution 0.1°F (0.1°C)
Measuring Range 10 to 90% RH
Accuracy ±3% RH (at 25°C, otherwise ±5%)
Resolution 0.1% RH
Display LCD
F/C Switchable Yes
Alarm Audible (Buzzer), Visible (LED)
Adjustable CO Alarm Limit Yes
Max Hold Yes
Date & Time Yes
Warm-up Time 60 seconds
Desktop Stand Yes
Wall Mountable Yes
Power Supply 4 AAA Batteries, AC Adaptor (Optional)
Product Certifications CE
Operating Temperature 32 to 122°F (0 to 50°C)
Storage Temperature -4 to 122°F (-20 to 50°C)
Operating Humidity Range 0 to 90% (non-condensation)
Dimensions 4.4 x 4.3 x 1.1" (113 x 108 x 28mm)
Weight 5.6 oz (159g)