"Specifications:

Measuring Range: 1.30 – 1.81 RI

Minimum Graduation Value: 0.01 RI

Dimension: 30 x 70 x 130mm

Weight: 600g

Set Includes:

1 x Gem Refractometer

1 x Polarizing Filter

1 x 1.5V AAA Battery

1 x Storage Box

1 x Refractometer Index Reference List (For 77 common gemstones, i.e. Calcite, Jadeite, Quartz etc.)

1 x Quick Start Guide"