COTK-57 Digital Carbon Dioxide (CO2) Temperature Humidity Meter 9999ppm NDIR Sensor IAQ Tester

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This meter measures CO2 level, Air Temperature, Dew Point (DP), Wet Bulb Temperature (WB) and Humidity (RH) and is an ideal instrument for Indoor Air Quality (IAQ) diagnosis.Features: Triple displ...
$164.90 USD
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This meter measures CO2 level, Air Temperature, Dew Point (DP), Wet Bulb Temperature (WB) and Humidity (RH) and is an ideal instrument for Indoor Air Quality (IAQ) diagnosis.


  1. Triple display
  2. Stable NDIR sensor for CO2 detection
  3. Statistics of weighted averages
    1. TWA (8 hours weighted average)
    2. STEL (15 minutes-weighted average)
  4. Backlight, Hold data, Min/Max
  5. Sound warning alarm
  6. Dual power source
  7. Easy manual calibration
  8. PC connection for online logging and data analysis (not included in set)
  9. Portable Design
  10. Updates reading every second
  11. Auto / Manual power off
  12. Factory calibrated


  • Measuring Range
    • CO2: 0~9999ppm
    • Temperature : -10~60°C (14~140°F)
    • Humidity : 0.1% ~ 99.9%RH
    • Dew Point : -20.0~59.9°C
    • Wet Bulb : -5.0~59.9°C
  • Resolution : 1ppm,0.1°C/°F, 0.1%RH
  • Accuracy :
    • C02 : ±50ppm or ±5% of the reading (0~2000ppm); ±10% of the reading (Above 2000ppm)
    • Temp : ±0.6°C / ±0.9°F
    • Humidity : ±3%RH (at 25°C, 10~90% RH); ±5%RH (at 25°C, others)
  • Warm-up time : 30 seconds
  • Response time
    • CO2 : <30 seconds (90% step change)
    • Temp : <2 mins (90% step change)
    • RH : <10 mins (90% step change)
  • LCD size : 26*44mm
  • Operating condition : 0~50°C, 0~95%RH (avoid condensation)
  • Storage Condition : -20~50°C, 0~95%RH (avoid condensation)
  • Power Supply : 4 x AA batteries
  • Battery life : >24 hours (alkaline batteries)
  • Meter size : 205 x 70 x 56mm ( L*W*H)
  • Dimension : 169(L) x 78.3(W) x 43.4(H)mm
  • Weight : 200g

Set Includes:

  • 1 x Portable CO2 meter
  • 4 x AA batteries
  • English Operation Manual
  • Hard Carrying Case

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund in the same payment form used at the time of purchase within four weeks of giving your package to the return shipper. This time period includes the transit time for us to receive your return from the shipper, the time it takes us to process your return once we receive it, and the time it takes for the refund to be credited to your account.

For more information, please refer to our Return, Refund & Warranty Policy or contact us.

Shipping Policy

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

For more information, please refer to our Shipping Policy.

Warranty Policy

Most of our items come with 1 year warranty for manufacturer defects. It does not include damage caused by misuse, accidents, abuse, alterations, neglect or other external causes.

The warranty will not extend to consumables (i.e. electrodes, calibration solution, battery, index oil), accessories, cable, compact disk and/or any written document bundled with the item.

For more information, please refer to our Warranty Policy.

1-Year Warranty
30-Day Returns
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