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30% OFF MH-Z19B Upgrade Version 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM US$30.93 US$43.99 View It

Overall:

LucReynders3 24/06/2020

CO2 measurements is very good. No calibration needed. I wired it to a nodemcu with Tasmota firmware flashed. Taslota also shows the temperature but this value is way off, 17 degrees C higher than the actual temperature. Strange since this offset is identical over the full range (can be used if the offset is compensated in sw). The temperature is only with a 1 degree resolution (not 0.1).

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