product details:

• String Action and Setup gauge
• Inch measurements on front
• Fraction/ Decimal/ Metric Conversion chart on back
• Long lasting etched printing.  The printing will not wear off from continues use.
• 1/64” (.4mm) thick stainless steel
• Overall size is 3 ½” x 2” (90mm x 50mm)

This evaluation tool can be used with guitars or basses to measure string height, string spacing, pickup height, saddle height and slot depth.  This is a great measuring tool for your guitar work bench.