OPL "Pocket" Diffraction Grating Spectroscope, with fixed slit & fixed focus. This spectroscope has been used throughout the world for more than 30 years & is recognized and respected by gemmologists & gemmological teaching centers worldwide. Constructed of stainless steel & black acetol, 55mm long, 12.5mm wide, weight 31 grams, packed in a distinctive blue lined transparent plastic case. As shown in "A Students’ Guide to Spectroscopy" by C. Winter Price £40.00 plus UK VAT & postage.
