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

Marsoni M251S
Sale price$63.00
Pay 4 payments of $15.75 a month.Shop Pay
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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4.7 ★★★★★
Based on 75 reviews
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Product Reviews
C
Verified Purchase
Carmen C.
Los Angeles, US
★★★★★ 5
Nice sink caddy
Color: Gold, Color: Gold
It was exactly as described- looks nice on my counter. I haven’t bought the scrub brush I want yet to put in the taller space but it def dries fast anytime water gets on it. I like the look on my counter space. It’s not flimsy, I like the color of the gold.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 30, 2026
M
Verified Purchase
Marco A Davila
Boise, US
★★★★★ 5
Effective!!
Color: Black, Color: Black
This caddy keeps my sink organized. It absorbs the water when I place my sponges on it and its super easy to keep clean. I squeeze as much waster as I can from the sponges so it doesn't wear out. I've had this a little under a year and it has held up exceptionally well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 17, 2026
P
Verified Purchase
Peace River Living
Massapequa, US
★★★★★ 5
Perfect for beside any sink even dorms
Color: Black
I bought this for my son for his dorm room for his sponge for washing dishes and for him to put his dish soap and his hand soap for everything that he could keep it all tidy because he’s actually quite organized and he actually really liked it and it looked very neat. It’s easy to clean. It wasn’t too big everything fit perfectly for the Myers hand soap, and dish soap. The color is neutral almost masculine is gray and black. And there is no issue of it falling because he kept it on a side table away from the sink so that nobody else would use it so it would be just his. So It was altogether and kept everything organized. He really liked it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 4, 2025
A
Verified Purchase
amazonaddict
Phoenix, US
★★★★★ 5
Attractive and works great. Be sure to clean the suction cups and sink before using!
Style: Scroll
I have wanted a sponge holder to put inside my sink for a while now. I wanted something attactive and I wanted it to work as it should. Seemed reasonable until I started looking and reading reviews. The biggest complaint appeared to be that these sponge holders do not stay attached to the sink. The reviews for this particular holder were great. Customers stressed cleaning the suction cups and sink before using. I am really glad they did because holder arrived in the packaging with zero instructions. Because I read the reviews I knew what to do and it worked! I am very pleased with this sponge holder. It is attractive, it feels really sturdy and it stays on the side of stainless steel sink just fine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 8, 2022
M
Verified Purchase
Megan
Louisville, US
★★★★★ 5
Pretty; sturdy; perfect size
Style: Contempo, Style: Contempo
Nice, sturdy little sponge and brush holder for the side of the sink. I was afraid my sink would me too small and spent lots of time trying to find a holder for the rim/countertop area. This one is not too big but fits my dobie and brillo perfectly. My sink is a little too short for a full fledged brush so when I tried to put in the brush I use sometimes it sticks up too much. That's really not the products fault so I won't subtract the score because of it. Also, I decided to put the holder flush against the side closest to me, instead of the side or the back of the sink. If I had chosen that location, the brush sticking out might not be an issue.
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Reviewed in the United States on July 26, 2016

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