Music Nomad MN601 Nut Height Gauge

Adjusting the string height on the saddle is an essential step in setting up a guitar or bass. This can be done quickly and accurately with the MN601 Nut Height Gauge.
The tool has the three most common saddle heights: .016 “, .018”, .020 “and three heights .012”, .014 “, .022” for flatter strings.
Made from smooth stainless steel without the annoying oil that is found on conventional feeler gauge sets.
The dimensions are engraved with a laser in inches and millimeters and assigned to the respective instrument.
Easy to understand instructions are attached to the handle .

https://www.musicnomadcare.com/How-To-Advice/Setup-Hub/