Professional gauge for measuring parallelism of rimless glasses frames, lens errors, etc. It also can be used to locating before lens punching and checking lens central point offset after grinded. <br><br><strong>Features:</strong> <br>Professional gauge for measuring parallelism of rimless glasses frames, lens errors, etc. <br>It also can be used to locating before lens punching and checking lens central point offset after grinded. <br>Made of high quality aluminum and copper material, very durable. <br>Various scales printed on the base, convenient to read. <br>The adjusting nuts is easy to operate. <br><br><strong>Specifications:</strong> <br>Material: Aluminum + Copper <br>Color: Blue + Yellow <br>Item Size: 19.8 * 9 * 2.5cm / 7.8 * 3.5 * 1in <br>Item Weight: 437g / 15.4oz <br>Package Size: 23 * 12 * 5cm / 9.1 * 4.7 * 2in <br>Package Weight: 632g / 22.3oz <br><br><strong>Package List:</strong> <br>1 * Parallelism Gauge