Quote Originally Posted by jstrack2 View Post
It will be very hard to get the strip resistance to give accurate readings. This is why the digital calipers use capacitance.

I think that the wheel will have to be removed of course (and a few other various pieces). The caliper hopefully will then slide easily. It will be outside of the container. A thin rod attached to the caliper and float will then drop into the liquid. When the float rises the rod will be pushed up and push the caliper slide part up too. At least this is how I imagine it. It may not work, but I think its is worth trying.

Since it will move very slowly I don't know that vibrations will be a problem (although I could be wrong!).
I think you will have a problem with with making a float big enough that it could lift the caliper. Remember that with the float, it won't start to actually float until the water level is at least the height of the float itself.