Review on Enhanced Precision with Woodworking Adjuster: Regulate & Measure Sawtooth Accuracy by Joe Meyer

When the thumbscrew is fully tightened, the lid still slips. You cannot fix the position for accurate measurements. I had to add some tape between the pieces to get enough of it through for the screw to tighten and stay. The scale on the side is metric only, the product image shows both metric and English.