No arguments with any of the above.

The needle on the scale on my meter broke/bent. I never liked trying to read it anyway. So I went to Harbor Freight and bought a digital carpenters angle gauge. By gluing a piece of 1/4 inch plywood on the shelf above the bubble level on the Robart meter, I was able to set the angle gauge on top of it and get a nice, easy, digital readout.

To make sure it was accurate, I set the rail of the Robart on top of a long level (that I know is good) and let it calibrate to zero. Subsequent measurements are very repeatable to...so I like it.

I most recently used it on an Ultrasport. The horizontal stab was already glued in place and while I was pretty confident it was on straight etc. the fact of the matter is it was where it was going to stay. So, the neat thing about the digital angle gauge is that it has a button to calibrate to zero, and once it is calibrated it takes all subsequent measurements to that newly acquired reference. This is very convenient because you don't have to spend time getting the fuse to an exact level position. Just block it up close by eye...put the angle guage on the stab and let it calibrate that as zero. It doesn't matter if the stab isn't perfect at that point because subsequent readings on the wing are relative to the tail calibration.

I slide the meter to the wing and get a digital measurement of incidence relative to the tail...it is always easier to move the wing saddle up and down a touch than it is a stab that is already glued in place!

In the end though, as accurate as I try to be, the error seems to come from the Robart brackets and how they attach to different shapes. So, I don't get too nuts about it and my guess is close is good enough.

As others have said as long as it is good relative to eachother; its good.

Great looking plane you have there and I hope you are having fun with it!

Tom