Out of interest, how are you guys measuring your tank levels?
I currently just use a float sensor, I tried a sonar sensor (multiple) - but found them to be inaccurate, the build up condensation on the sensor, and as it drips off, the sensor goes all over the show.
EDIT:
Unrelated to HA, but related to IoT - has anyone made a portable UV sensor (sunlight) - I want something to accurately measure UVA/UVB that's portable, with a screen. I suppose it could log to HA via Bluetooth.
Tried to find a commercial product, there are one or two available in places like Aus - but not much internationally.
In a situation where I do not want to rely on and trust internet provided UV figures.