1 Set 2 Pcs Measuring Pen Wear-resistant Diamond Detector without Battery

Description Before using the Moissanite pen the tested diamond must be tested with a thermal conductivity meter and displayed as a diamond and then the Moissanite pen is used to determine whether it is a diamond or a moissanite. Features -Color: Assorted color. -Material: Engineering plastic. -Size: About 18.50X5.50X3.00cm / 7.27X2.16X1.18inch. -Simple calibration for stones of various sizes. -The operation is simple and the test is accurate. -Accurate and reliable reading simple but practical. -Non-destructive testing do not harm the diamond. -LED light and audio result indication true and accurate. -Note: No battery packed.