Gem Tester Diamond Selector Gemstone Tester Pen Hardness

Gem Tester Diamond selector II Checking Tool Can Check Any Stone Hardness Checking Japn Easy operation. LED light and audio result indication. Simple calibration for stones of various sizes. Accurate and reliable reading. Matched with a testing platform for loose stones. Light weight, matched with a convenient carrying case. Detailed user manual is included in the package. Maintenance and repair: 1, the instrument is very sensitive to the probe, must be particularly careful to protect, do not use should be set on the sheath. 2, the preparation of the indicator light is very dark, shows the battery will run out, should be timely replacement battery. 3, the instrument is not used for a long time, please take out the battery. 4, in order to detect accurately, the proposed correction once a year.