Gem Refractometer - Gemology Gemologist RGM-100 w/ 789nm Flashlight +RI 1.81 Refrigeration Oil Step 2: Place a drop

Step 2: Place a drop of the calibration fluid (distilled or R/O water) onto the glass prism of the unit

Item Description: NI Supply ZGRS-10ATC Portable Salinity Refractometer

you get a replacement for free

Veterinary clinics and hospitals use this unit for rapid testing of animal urine

Semi-Synthetics

Gem Refractometer - Gemology Gemologist RGM-100 w/ 789nm Flashlight +RI 1.81 Refrigeration Oil Step 2: Place a dropItem Description: RGM 100 Portable Gemological Refractometer with a flashlight COMES WITH 10 Gram Vial (1. 8ml) of 1. 81 Index Fluid REFRBUSHED! Comes with instructions! Written by our staff, not converted from another language! Comes with a Gemstone Refractive Index Chart! Comes in a black zipper case! This unit comes with AMERICAN MADE 1. 81nD Refractive Index Fluid! Very few units come with the "good stuff", but this one does! Product Specs: