@nix_nix, It’s connected to a waterproof electrical connector I installed on the sides of my buckets. Inside there is a thermometer that reads my reservoir temps. If it goes out of 60-68 F range, the light goes red. It helps me keep an eye on my water temps. I know right away if I need to do something (or: toss in a frozen bottle). You can see my screen in some of my recent posts. Its just a tent monitor I built using an Arduino.
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