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Jewelry and Refractive Index Testing tool 1.35 - 1.85 Range Refractometer refractometer is the most important professional tool for identi...

Optical equipments for built-in Led jewelry Hand-Held Product description The Refractometer is an important instrument which mea...

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Prod uct adva ntag es. 1.Cube cutting platform, long service life and high flatness. 2.Using high-precision integrated cutter head holder, no need to ...

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