One of my titles at work
https://share.icloud.com/photos/04ny...qF-MDzzq-ROhEg
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I take pride in the sensors reading accurately in the rental fleet I manage.
I use a clear elbow on the outlet and watch what comes out.
I fill the tank full up into the toilet over and over until clean water comes out. Usually the sensors read correctly after that. I’ll leave the valves open and the cap off to let them dry.
Sometimes the sensors do need to be replaced
If yours don’t read correctly you have solids caked to the walls of the tank or they are just broken. A lot of tanks have a second place ready for new sensors to be installed. The thin wires are fragile and may be the problem.