Reddit reviews Vktech 5pcs 2M Waterproof Digital Temperature Temp Sensor Probe DS18b20
We found 3 Reddit comments about Vktech 5pcs 2M Waterproof Digital Temperature Temp Sensor Probe DS18b20. Here are the top ones, ranked by their Reddit score.
9 ~ 12 adjustable resolutionPower supply range:3.0V-5.5VNo other components, unique single bus interfaceOutput lead:red (VCC), yellow(DATA) , black(GND)able length:Approx.200 cm
These guys:
https://www.amazon.com/gp/product/B00EU70ZL8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I'm not sure what you could do to waterproof your existing sensors if you have no room for shrink wrap. For what it's worth, with my setup I used these ds18b20 sensors from amazon: https://amzn.com/B00EU70ZL8
They fit fine without any modification inside my 16", .305" ID thermowell that I got from here: https://www.brewershardware.com/16-Stainless-Steel-Thermowell.html
The amazon listing has the diameter of those sensors at .6 cm (.24")
OK, that sounds like adding the DS18B20 temperature probe to the Fibaro Door/Window Sensor is fairly straight-forward.
Feel free to correct me if I found the wrong parts, but many of the reviews seem to be doing the same thing you're suggesting, for monitoring freezers, etc.