SUPPORT: Offline or call 1.800.522.1448
AcuRite Digital Thermometer & Humidity Monitor

AcuRite Digital Thermometer & Humidity Monitor

SKU: 290-0891

Be the first to review this product

AcuRite Digital Thermometer is a quality instrument that has been engineered to provide accurate humidity, temperature & time readings to help fight against dust mites and mold by knowing the humidity levels.

Free shipping on all purchases over $79.00
100% Money Back Guarantee

MSRP: $32.00
Sale Price: $25.99

Sorry, just sold out
but it will still ship soon!

The AcuRite® Digital Thermometer and Humidity Monitor makes monitoring humidity levels easy and worry free. If you suffer from dust mite allergies, doctors recommend you keep humidity levels in the 45% range to help minimize exposure to allergens. Key in following this recommendation is to keep an accurate check on your home's humidity levels. Ordinary humidistats can be off by as much as 20% and can give false readings, but AcuRite lives up to its name with only nominal variances in accuracy. The AcuRite also displays temperature, and comes with many other versatile features.  1-Year Manufacturer's Limited Warranty.

Humidity Notes:

  • Science tells us that dust mites need high humidity to live and multiply in the home.
  • Humidity over 55% is the "red zone." Dust mites love it, and multiply like crazy!
  • When the relative humidity level in the home drops below 50%, dust mites slow down.
  • Humidity under 40% actually kills and eliminates dust mites altogether because it's too dry for them to survive (except in your bed where it's always warm and humid due to your body, which is why bed encasings are so critical).
  • If your humidity levels are high, you may need to additionally consider a dehumidifier.


  • Precise humidity and temperature readings
  • Accuracy within:
    • Temperature:  ± 4°F
    • Humidity:  ± 5%
  • Big, bold, easy-to-read LCD displays relative humidity, temperature and time
  • Temperatures displayed for both:
    • where the monitor sits, and
    • where the included sensor probe is located
  • 10' foot, weatherproof and water-resistant sensor probe for easy positioning:
    • outside a door or window
    • inside a cage, tank or other area
  • Ability to switch between:
    • °F or °C temperature display
    • 12-hour or 24-hour clock mode
  • Large buttons to display min/max:
    • indoor recorded humidity
    • indoor recorded temperature
  • Back-light button (for momentary illumination)
  • Stand on tabletop or wall mount
  • Comes with sensor probe and instruction manual
  • Uses 1 "AAA" alkaline battery (not included)
  • 1-Year Limited Mfr. Warranty

Specifications for AcuRite Digital Thermometer and Humidity Monitor ‐ Model 00891

• Dimensions (H x W x D): 4.5" x 2.5" x 0.5"
• External Sensor Probe: 10 feet  (3m)
• Indoor Temperature Range: 32°F to 122°F  (0°C to 50°C)
• Sensor Temperature Range: -58°F to 158°F  (-50°C to 70°C)
• Temperature Accuracy: up to ± 4°F
• Indoor Humidity Range: 16% to 98% Relative Humidity (RH)
• Humidity Accuracy: ± 5%
• Power: 1 AAA alkaline battery (not included)

Instructions for AcuRite Digital Thermometer and Humidity Monitor (Model 00891)

Please see Owner's Manual tab for detailed instructions.

Basic Setup:

  • Battery:
    • Slide battery compartment door open and install one (1) fresh "AAA" alkaline battery (not included).
    • Be sure polarity markings on battery match the markings inside the battery compartment.
    • Replace battery with a fresh one when display starts to fade or when unit stops functioning.
  • Temperature/Clock Display:
    • Press the "TEMP/CLOCK" button to switch between clock and indoor thermometer.
  • Setting the Clock:
    • Slide the "TIME SET LOCK" switch on the front of unit to "TIME SET" position.
    • Depress the "HR" button to set the correct hour.
    • Depress the "MIN" button to set the correct minute.
    • Slide the switch back to the "LOCK" position.
  • °F/°C Switch:
    • Temperature readings can be displayed in your choice of °F or °C.
    • Use the slide switch on back of unit to switch between Fahrenheit/Celsius display.

Placement and Location:

  • Once setup is complete choose a location to place your monitor.
  • Choose an area free of water, dust and heat that may affect accuracy of humidity and temperature readings on unit.
  • Stand unit on a tabletop or wall mount.


  • Once you've properly set up and located your monitor, there's nothing more for you to do, but to enjoy it!
  • Back-Light:  Press "LIGHT" button for illumination. (Note: frequent use of back-light will shorten battery life.)

Click here to view the Owner's Manual for the AcuRite® 00891 Digital Thermometer and Humidity Monitor.

Write Your Own Review

You're reviewing: AcuRite Digital Thermometer & Humidity Monitor

How do you rate this product? *

  1 star 2 stars 3 stars 4 stars 5 stars

Other people have also looked at: