Music Nomad MN603 Precision Radius Gauge Set

Measuring the fretboard and string radius is an essential step in setting up a guitar or bass. With the two-part MN603 Precision Radius Gauge Set, this can be done quickly and accurately.
The set measures the radii 7.25 “, 9.5”, 10 “, 12”, 14 “, 15”, 16 “and 20” for electric guitars, electric basses and western guitars.
Made from smooth stainless steel without the annoying oil that is found on conventional feeler gauge sets.
The black finish makes it easier to see whether the strings are lying. A brief instruction is also engraved.
Made of stainless steel with polished corners.
https://www.musicnomadcare.com/How-To-Advice/Setup-Hub/