Print two of these and use together with a PVC tube with outer diameter of 12 mm as a water level tool.

Use appropriate screws to mount the two printed parts on two wooden sticks with the exact same length and connect them with the tube. Fill the tube with water and calibrate the tube position so that the water level is zeroed on each side.

Print two caps to keep the water from getting out while moving around. Must be removed when measuring!!

This tool makes it easier to handle the tube when you measure. I have used it to measure my garden when preparing a deck. This is my first published thing on Thingiverse and I might modify it in the future.

The model should be pretty easy to print without any exceptional print settings. Just remember to mirror the second part (in x direction ) in your slicer, if you want the second piece the other way.