I posted this on a different thread and got a couple of e-mails that I should post it here.

Years ago I needed a second incidence meter and couldn't get to a hobby shop so I whipped this one up out of 1/4" balsa. The left vertical is a snug fit on the horizontal and the notches were cut after assembly and after marking with a square. Put a small bubble level on top (I use a line level) and you've got a no cost incidence meter.

It measures dead on with my Robart meter. It won't tell you degrees but for 0-0 measurements it's great.

Dave