It is very important tool for identification of diamond. easy to read out the refractive index.

1. High hardness CZ testing prism;

2. With big eyepiece for easy read out the RI;

3. Measuring Range: 1.35 -1.85 RI;

4. Accuracy: ≤±0.002;

5. Two ways power supplies: 2x AAA batteries and 3V DC with world wide 100-240v;

6. Appearance: white aluminum alloy;

7. Package: one set in a toollit.

Accessories:

1. 2x AAA batteries;

2. 2ml refringent oil;

3. power adapter.