Gem Refractometer, 1.35-1.85 Gemstone Identification Tool, with Retractable Eyepiece - 28mm, Storage Box, for Measuring The Refractive Index, Jewelry Test Tool

This refractometer features high accuracy and easy operation. Considered by many to be the most important of all gem testing instruments Specifications: Table material: stainless steel table Scale range: 1.35-1.85 black background high contrast scale interface Light source: built-in quasi-monochromatic LED light source, wavelength 589 ± 3nm Dimensions: 140mmX 42mmX95mm (large size) Power supply: 2*AAA batteries (not included) or external power supply Voltage: AC100--240V Power switch: push button switch, 2-speed brightness adjustment switch Product includes: 1*Gem Refractometer

• 【Gemstone Refractometer】This refractometer is designed for measuring the refractive index of and solid materials. It can accurately measure how light refracts through stones
• 【Material】With wear-resistant prism stainless steel tabletop, easy to clean. 2 power supply methods: 2*AAA batteries (not included), plug in
• 【Easy to read】With 28mm eyepiece, retractable diopter adjustment, internal scale display, digital range 1.35-1.85mm, with 2-speed light adjustment, accurate reading
• 【High Precision】Highly accurate and easy to operate. Lightweight and compact for easy carrying. Provides key identification and distinguishes between opaque and transparent
• 【Application Function】Quickly and accurately identify single and double gemstones, moissanite/diamond/colored gemstones, designed for measuring the refractive index of gemstones and solid materials