I got me this ring gauge brought plastic, because I wanted to spend as little money for it. For the price I think it's very good and the annoying fumbling with tape measure from the furniture store or even string and ruler eliminates finally ;-) However, I would have thought it more useful if (most important) rather than the outer diameter of the ring inner diameter would be on the individual parts in addition to the ring circumference, as this is yet specified common in dealer-size specifications of rings. The imposed metrics can be read well only with enough light, especially in the parts of dark blue plastic. As a lighter color would have been better. But overall, as I said a useful part at a reasonable price.
