Useful scales: mainly made of stainless steel, rust-proof and durable. The gauge provides accurate measurement of string height, saddle height, depth of saddle slots, pole piece height of pickup, fret slot depth and nut height. FRET PROTECTORS: Stainless steel fret protectors in 2 sizes have been specially designed to protect the fretboard while working on your frets. WIDELY USE: Widely used for stringed instruments such as guitar, bass, mandolin, banjo, etc. Very practical and useful, preferred measuring instruments for DIY, guitarists. Multiple use: pocket size with double-sided multiple use. Imperial (inches) one side, metric (millimetres) on the other side. With conversion table of the string action on the 12th Waistband printed. Best gift: best gifts for guitarists and musicians. Great gift for birthdays, Christmas, New Year, Father's Day, Thanksgiving and holidays