High-precision probe can quickly distinguish diamonds and moissanite from other fake stones, the probe of the diamond tester pen has good flexibility, and supports a minimum of 2pt gemstone detection Diamond tester is simple to operate, hold the inst ent (put your finger on the metal on the back) at 90 degrees into the diamond , then the indicator appear green light (diamond) or blue light (moissanite) Our moissanite tester has a built-in metal detection function, if it comes into contact with a metal substance, an orange signal appear on the indicator, avoiding misjudgment of fake diamonds Diamond tester pen has a small and exquisite design, easy to carry anywhere. The diamond testing pen has a quick warm-up time of 25 seconds, up to 2 hours of continuous use, and also has a beeping alert function Diamond tester professional is designed with a rubberised lacquer finish that provides non-slip comfort and control. diamond tester package includes two AAA batteries Color: As Shown Material: plastic Package Contents: 1pcs * diamond tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.