Hand Held Refractometers E-line Gemological

The instrument is made of painted durable alloy and is supplied with an illuminating device, polarising filter and instruction manual. The E-Line Gemological refractometer is a very low cost, lightweight measuring instrument used by jewellers and traders of gemstones to measure polished stones over a refractive index range of 1.30 to 1.81 RI. The instrument can also be used to identify whether a particular stone is Isotropic or Anistropic (uniaxial or biaxial). For full details on the use refractometer and data relating to the RI of gemstones, please download the instruction manual. Refractive Index is one of the most important optical parameters used to identify and authenticate polished precious and semi-precious gemstones.