External Monochromatic Yellow Light Gem Refractometer, + 1.80 RI Oil, Gemological, GIA TOOLS by MAGNUM_MEDIA at Conway Pub & Eatery. MPN: RGM-100. Hurry! Limited time offer. Offer valid only while supplies last. Measuring Range: 1.30 - 1.81 RI Minimum Graduation (RI): 0.01 RI Illumination: Internal illumination with momentary switch Size: 30mm x 70mm x 130mm Scale Division: 0.01 nD Weight: 0.4 kg Ranges of Application: Laboratory, Gemology Filter: Polarizing filter Made of durable heavy metal and scratch proof glass This item is commonly known as Gemstone Refractometer, is the primary and most powerful tool in identifying and authenticating polished precious and semiprecious gemstones and also observing
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