Update: Labor Day camping.
Our annual Labor Day trip is the only trip we go on without full hookups. Thus accurate black tank readings are more essential for this weekend than any other trip we take.
After a few days the panel in the coach had already read 2/3 full LOL but the DIY sensor only read 21%. I didn't check again until we were ready to leave: Opening the hatch and tapping on the tank (on some Axis/Vegas units you can get direct access to the black tank by opening a side hatch) I figured the tank was about 1/2 full. Check the panel: 2/3 full LOL, check with my phone: DIY sensor was reading 45%--that is about 1/2 full.
Since we were ready to leave and still had plenty of fresh water I turned on the bathroom faucet and watched the black tank reading go from 45%, 50%, 55%, 65%, 70%. Again tapping on the side of the tank..yup about 3/4 full. Panel reading: still 2/3 full LOL. At this point we left and dumped. DIY sensor after dumping: 0%, panel after dumping 1/3 ! LOL.
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