Optima Refractometer & Light
This outstanding instrument gives clearer, brighter and more crisp readings than units that cost twice as much. The sharp lines are clearly visible and the correct reading is easily seen immediately. The unit has a built-in sodium (yellow) filter, eliminating the need for a special sodium light source. It comes with a white light source that fits in behind the sodium filter. All are packaged in handy vinyl travel case.
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