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 Range0 to 999 ppm
Accuracy±5% of reading or ±10 ppm
Resolution1 ppm
Sensor TypeStabilized electrochemical sensor
Measuring Range32 to 122°F (0 to 50°C)
Accuracy±1.2°F (0.6°C)
Resolution0.1°F (0.1°C)
Measuring Range10 to 90% RH
Accuracy±3% RH (at 25°C, otherwise ±5%)
Resolution0.1% RH
F/C SwitchableYes
AlarmAudible (Buzzer), Visible (LED)
Adjustable CO Alarm LimitYes
Max HoldYes
Date & TimeYes
Warm-up Time60 seconds
Desktop StandYes
Wall MountableYes
Power Supply4 AAA Batteries, AC Adaptor (Optional)
Product CertificationsCE
Operating Temperature32 to 122°F (0 to 50°C)
Storage Temperature-4 to 122°F (-20 to 50°C)
Operating Humidity Range0 to 90% (non-condensation)
Dimensions4.4 x 4.3 x 1.1" (113 x 108 x 28mm)
Weight5.6 oz (159g)