14K Yellow Gold Calibration Disc Gemoro Auracle AGT1 AGT2 Gold Testers<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Metal type: 14K Yellow Gold</li><li>Metal color: Yellow</li><li>Karat/purity: 14K</li><li>Gauge/thickness: 26 ga (0.405mm) Diameter: 1/4" (6.4mm)</li><li>Used to calibrate AGT1， AGT2， AGT3 and AGT-BLUE gold testers</li></ul></div><img src="http://ecx.images-amazon.com/images/I/4100iYpZaeL.jpg" noproxy>