The quality of this action gauge is very nice. The metal is thick enough so the gauge does not bend. The markings are clear and easy to read. The string height markers are not just line marks, as with some other manufacturers, but are coloured-stacks. This makes it easier to assess the actual height of the string. Very helpful.
It has every possible marks for string and pickup adjustments. Recommended values for guitar/bass string height, printed on the back give a good starting point for further adjustments, especially for those who are new to setting up their own guitars.
Overall, a great tool at fraction of the price you pay for some other brands. Highly recommended.