<b>String ruler:</b> <br>A ruler for measuring string height, frets, nuts, saddle, and other parts of a guitar. <br>Material: stainless steel <br>Size: 55mm×90mm×1mm <br>Weight: about 30g <br>Graduations displayed: mm and inches <br> <br>The surface is used for adjusting the string height. <br>Hassle-free. By just holding this card to the strings, you can visually find the suitable string height. <br> <br><b> Fritz ruler</b> <br>For use on various guitars such as gut guitars, electric guitars (raise or lower string height), acoustic guitars, and bass guitars (including six string bass guitars). <br>The reverse side is for string spacing adjustment. <br>The string spacing pitch displayed is 38/40/41.5/43/45mm on guitars; <br>38/40/42/45mm on bass guitars (can also be used on five string bass guitars); <br>and 50/52mm on gut guitars. <br> <br>With only this card too, distortions and gaps can immediately be identified. <br>An indispensable item for guitar work. For guitar crafting or repair.