How to Use:
1: Wipe the to be tested and the refractometer table, and apply 1 to 2 drops of refraction oil evenly on the surfaces of the prism.
2: Put the to be tested on the platform, let the completely cover the surfaces of the prism, and ensure that the refracting oil is in full contact with the .
3: Press the tail of the flashlight to turn on the light source.

Specification:
Item Type: Portable Refractometer
Material: Glass, ABS
Product size:Approx. 128 x 60 x 32mm / 5.0 x 2.4 x 1.3in
Measuring Range: 1.30 to 1.81
Minimum Division Value: 0.01
Liquid: Refractive Oil (Shipped with Liquid)
Flashlight Battery: 1 x 1.5V AA Battery (Shipped Without Battery)
Weight: Approx. 590g / 20.8oz

Package List:
1 x Portable Refractometer1 x Flashlight
1 x Refractive Oil
1 x Box
1 x User Manual

Note:
1.The refractive index of is a very important optical parameter. The gloss of the can be determined by this parameter. Since different have a fixed refractive index, all kinds of gems can be determined according to the refractive index. Birefringence can also be measured. This parameter can be used to determine whether a is uniaxial or biaxial.
2.Shipped with liquid, shipped without battery.