For my freezers I’m using the older Fibaro fgk-101 with external probes. However in my hot tub I use a smartthings sensor double vacuum sealed with a peace of pool noodle. It just floats around. Also have this setup without the pool noodle inside my 2 aquarium filters. The only bad thing I’ve found is the Batteries only last about 6 months. Small price for peace of mind when I get temp alerts.
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