Fangrui Product Details 1. Accurate Scale: This Guitar Ruler Adopts High Precise Digital Scale, Which Can Easily Measure Guitar Sizes Such As Pitch, Key Spacing, String Spacing. 2. Stainless Steel Made: This Guitar Fret Ruler Is Made Of Stainless Steel, Which Is Sturdy And Can Be Used For A Long Time Without Rusting. 3. Versatile Use: This Guitar Set Up Gauge Is Suitable For All Types Of Guitars, Including Electric Guitar, Acoustic Guitar And Bass Guitar. 4. Easy To Use: Simply Place This Guitar Ruler On The Head And It Will Automatically Fall Into The Strings, Easily And Conveniently Measure The Size Of The Guitar. 5. Portable Size: This Guitar String Height Gauge Is Compact Is Size, Easy To Carry, And Very Practical, Is A Necessary Tool For Luthier. Item Type: String Action Gauge Ruler Colour:black Material:stainless Steel Package Contents: 1 X String Action Gauge Ruler Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Pictu