User Manual

Contact Liquids
Contact liquids are required to expel air between the measuring prism and gemstone under test.
The contact liquid must be of a higher refractive index value than the gemstone under test;
otherwise the refractive index of the contact liquid will be read. Contact liquids may be extremely
harmful if not handled correctly – make sure that the guidelines for the liquids are followed carefully
and read the Health & Safety data supplied (also available from the Technical Centre which forms
part of B+S website at www.bellinghamandstanley.com).
Contact liquids are available from Bellingham+Stanley as listed below:
Order Code Description Refractive Index Value (RI)
10-43 Monobromonapthelene (6ml) 1.65
10-61 Methyl Iodide (3ml) 1.74
10-62 Sulphated methyliodide (10ml) 1.79
Specification
Measuring range 1.30 - 1.81
Minimum graduation value 0.01
Size 30 x 70 x 130mm
Weight 400g
Batteries AAA 1.5V battery
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