9 Scientific instruments and apparatus, namely, [ layer analysis instruments, calculators, vacuum meters, electric conductance meters,] frequency meters, photometers, light detectors, material testing machines for testing the composition of gems and pearls; diamond testers; p[ earl comparison sets, ] dichroscopes, polariscopes,[ proportion scopes, ] spectrometers, [ gold testers; calipers; digital calipers; ] loupes, imaging machines for use in testing the composition of gems and pearls; microscopes; scales; refractometers, and spectroscopes; measuring instruments for measuring light, weight, volume, mass, diameters, density, clarity, color, cuts, chemical structures of gems and pearls; measuring instruments for measuring the proportions and composition of gems, pearls and jewelry; microscope lamps; ultraviolet viewing apparatus for viewing gems and jewelry; light beam projection instruments for use in grading diamonds and gems; optical filters, color filters and polarizing filters; color testing equipment, namely, color comparators and apparatus for testing the color of gems, pearls and jewelry; ultraviolet and fluorescent testing apparatus for use in testing, examining, grading and evaluating gems, pearls and jewelry; photo-optical instruments for viewing and imaging gems, pearls and jewelry; grading instruments for grading, examining, and testing gems, for grading, examining and testing pearls, and for analyzing jewelry; portable laboratory apparatus for use in measuring, analyzing, grading, examining, testing and evaluating materials, namely, diamonds and other gemstones; portable laboratory apparatus for use in measuring, analyzing, grading, examining, testing and evaluating the characteristics of gems, pearls and jewelry; scientific instruments and apparatus for examining, testing, evaluating and appraising gems, pearls and jewelry; [ pre-recorded CDs, ] [ DVDs, videotapes, ] [ audiotapes featuring educational materials in the field of gemology ]