Monochromatic Light Source

Narrow band- Monochromatic yellow light gives a much cleaner, sharper easier to read result with your refractometer, it is also useful for -calibrating the scale in Spectroscopes with included scales. the BEST PART IS IT RUNS ON A RECHARGEABLE BATTERY AND IS SMALL!! VERY PORTABLE. Great for the Proffesional Appraisor and the Gemological- Student!





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