@gretchengehrke compiled some:
- Hach
- Fisher
- ThermoFisher
- PerkinElmer
- Vernier
- Carolina Lab Supply
- United Scientific Supplies
- HOBO (Onset)
- CHEMetrics
- Fondriest
- Nasco - http://enasco.com/science
Let's compile other sources and URLs, on this page:
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@Ag8n found you can look on Amazon for aquarium sensors! https://publiclab.org/questions/Ag8n/02-12-2018/substitution-for-conductivity-meter
Including total dissolved solids -- very cool!
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