Tri Electronics GXL-18 Diamond Wizard Gold Diamond Moissanite Test Kit TRI Electronics II-KitB-14-TE – Tri Electronics GXL-18 Professional Electronic Gold Tester: The GXL-18 reliably measures gold karatage to the nearest karat in the 6 to 18 karat range. Above 18 karats, the unit reads “18 karats or better”. Karat readings appear directly on the LCD [...]