Adafruit SCD-40 - True CO2, Temperature and Humidity Sensor - STEMMA QT / Qwiic

Adafruit SCD-40 - True CO2, Temperature and Humidity Sensor - STEMMA QT / Qwiic

Marsoni

M251S

$63.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Adafruit SCD-40 - True CO2, Temperature and Humidity Sensor - STEMMA QT / QwiicThe SCD 40 is a photoacoustic "true" CO2 sensor that accurately measures the concentration of carbon dioxide (CO2) in ambient air. Unlike sensors like the SGP30, which approximate CO2 levels from VOC gas concentration, the SCD 40 directly measures CO2 in parts per million (PPM), making it a reliable tool for environmental sensing, air quality monitoring, scientific experiments, and ventilation studies. While it is larger and more expensive than some

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A little on the pricey side, but really sturdy and well made. I needed an odd size set of brackets to fit a shelf in an awkward spot. I wasn't sure I'd find brackets with arms long enough for my needs without using some ugly white hardware-store shelf brackets. These look great, are very heavy duty, and just what I needed. I debated the purchase because of their initial cost, but once I got them I realized their quality warranted the premium price. Overall I'm very happy with them.

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Reviewed in the United States on June 26, 2024

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Amazon Customer

Grantham, US

★★★★★ 4

helf Bracke

Size: 4 Pack

Just what I needed

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Reviewed in the United States on May 2, 2026

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Mechelle Burk

Chelsea, US

★★★★★ 5

Make sure and screw them into a stud, otherwise the shelf is very flimsy

Size: 10 Pack, Size: 10 Pack

These are amazing!!!

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Reviewed in the United States on December 26, 2025

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Keith

Waukegan, US

★★★★★ 5

Worked Perfectly

Size: 4 Pack

They worked perfectly, I use them to hold a hutch inside a trailer to keep it from moving since it was not gonna be mounted against the wall. I use three of the four of these from the frame of the roof for the trailer down to the top of the hutch and they worked excellent

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Reviewed in the United States on June 9, 2025