Measuring and testing machines and instruments in the nature of electronic spectrophotometers for use in identifying and measuring colors, nanoparticle size analyzers, zeta potential analyzers, photometers for measuring total luminous flux, liquid crystal display analyzers being colorimeters, electronic devices for measuring and monitoring the thickness of reflective films, spectral ellipsometers, array spectrometers other than for medical use, photo detectors being optical sensors, charge-co...