While buying parts for the #knowflow sensor collection, I saw some pretty affordable <$20 sensors on Amazon:
https://www.amazon.com/Molop-Calibration-Aquarium-Swimming-Drinking/dp/B07CPM8TY9/
https://www.amazon.com/gp/product/B01FPG89CE/
Do people have experience with these, know about their limitations, or has anyone compared them to, for example, DF Robot's collection of sensors that connect to Arduino?
For one, these sensors don't seem to log data, but they're so easy to use otherwise that they seem pretty good for a workshop, for example!
cc @charlotte_clarke @wmacfarl @Bronwen @stevie @eustatic @safari @belkinsa @Filipaul @Ag8n @madtinker
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