HCHO Range: 0-1.999. 1 x Air Detector. CO2 Range: 0-5000. If you do not receive our reply within 48 hours, pls. If you are satisfied with our service, pls. Easy To Use: This tester is very easy to use, wherever you want to test the air quality, just turn the tester on and put it in that place, then wait for the result.
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