Refractometer white For the partially sighted_No as designed at the Chelsea

as designed at the Chelsea College of Science and Technology in 1934

Weighs down to 0

adjustable in two directions

Gives correct results about 95% of the time (6% false positive rate

fifteen not five)

Refractometer white For the partially sighted_No as designed at the ChelseaSummary For the gemmologist the refractometer is the most important gem tester after a loupe. It measures refractive index (to what extent light is bent as it passes through the gemstone). This product is intended for gemmologists (or those about to study gemmology) instructions are not included. Advanced model, has the advantages (over the standard model): large eyepiece enables easy viewing of the measuring scale (much easier than on a standard