Book - Visual Optics - £20 plus postage Video (one hour) - £39.50 plus postage Hanneman/Hodgkinson refractometer complete kit and tables as shown £45.50 plus postage
Alan Hodgkinson F.G.A., D.G.A.Telephone 01294 822358.
Or e-mail your request via Webmaster@scotgem.demon.co.uk
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