Gem Gemological Gemelogy Refractometer Built LED

Item Type: Jewelry Tools & Equipments Model Number: GR-701B Jewelry Tools & Equipments Type: Testers & Measurements Color: Black Type: Gem Refractometer Measuring Range: 1.30 - 1.81 RI Minimum Graduation: (RI) 0.01 RI Illumination: Internal Light Source with momentary/power switch Scale Division: 0.01 nD Ranges of Application: Laboratory, Gemology Filter: Polarizing filter Power Source: 3 x AG13 1.5V button batteries Place of Origin: China (Mainland)