1.35-1.85 Gemstone Refractometer,Gemstone Refractometer, Diamond Gemstone Tester Lab Refractometers Jewelry Refractometer with Built-in Led Light Source, for Jewelry and Diamonds

The Jewelry Refractometer offers high precision with a measurement accuracy of ≤±0.002 and a ruler range of 1.35-1.85 on a black background for enhanced contrast and clarity. Specification:Name: Jewelry RefractometerMeasurement accuracy: ≤±0.002Ruler range: 1.35-1.85 black background high contrast ruler, clearer interfaceLight source: Built-in quasi-monochrome LED light source, wavelength 589±3nmExternal dimensions: 140mmX42mmX95mm (large size)Weight: 561gPower switch: push button switch, two-speed brightness adjustment switchCountertop: All stainless steel countertop, easy to cleanpacking list:Jewelry Refractometer*1

• Easy to Read: With 28mm eyepiece, retractable diopter adjustment, internal scale display, digital range 1.35-1.85, with 2-speed dimming, accurate reading.
• Gem Refractometer: This refractometer is designed for measuring the refractive index of solid materials. It accurately measures the refraction of light in a stone.
• High Precision: High precision and simple operation. Lightweight and compact, easy to carry. Provides key identifications that distinguish between opaque and transparent.
• Material: Use wear-resistant prism stainless steel countertops, easy to clean. 2 power supply methods: 2*AAA battery (not included) or plug-in.
• Application Function: Quickly and accurately identify single and even gemstones, moissanite/diamond/colored gemstones, designed to measure the refractive index of gemstones and solid materials.