String Instrument Accessories -Guitar String Action Gauge Generic Brand Highlights Guitar String Action Gauge Description: Accurate string action gauge in number increments of 0.010""(ten thousandths of an inch) and in 0.005" line increments, ultra-precise guitar setup! Laser etched through the black surface, deep into the stainless metal. Fret Height / Fret Wear Gauge in 0.005"" increments. No more fumbling with calipers, rulers or feeler gauges. The 3 sides of unequal lengths are CNC machined, precision diamond ground and polished. The silver square in the lower corner of the gauge, less than 0.010 in. thick, allows it to slide into every nut slot - including the tall, narrow slot. material: stainless steel specification: Simply place the small wedge at the bottom of each nut slot - and the other end up to the 2nd fret, then measure the gap as the gauge passes over the 1st fret . Focusing on the perfect string pitch has never been easier because it leaves the nut. Size Chart: L x W x T: Approx. 85.7 x 54 x 0.52mm / 3.37 x 2.13 x 0.02inch Package includes: Guitar String Action Gauge, 1 piece Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be an error of 1-2 cm in the size.