nogooduser, (edited )

My tank came with a mounting point on the top of it where you can fit an ultrasonic sensor. You just configure it with the depth of your tank and that’s it. I have a unit inside that shows how much oil I have left.

Apparently, it uses an RF protocol that can be intercepted and interpreted in HA with the right dongle but I haven’t done that.

Edit: mine looks like this although with different branding.

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