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Shape 5-Point Star (sides slightly bowed outward) Factory Number SP 474 Number of Holes 31 Largest Hole 12 mm × 12 mm Smallest Hole 9 mm × 9 mm Material Hardened steel Origin Italy Compatible Metals Gold
Positive-lock mechanism engages post groove
Top work surface features sharp corners for precise metalworking
Each chain features round rolo links approximately 2
Refractometer Prop 65 - Lead Shape 5-Point Star (sides slightlyThe GemPro refractometer is a primary gemological instrument used to measure the refractive index of gemstones for accurate identification. Clear optics and an easy viewing lens make readings straightforward, helping you quickly determine one of a stones most critical optical properties. Features Measures refractive index for gemstone identification Easy viewing lens for clear scale observation Designed for professional gemological use Compact
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