ANALYTICAL INSTRUMENTS-NAMELY, REFLECTOMETER, COLOURIMETER, FLOURIMETER, ABSORPTIOMETER, ABSORPTIOMETER/REFLECTOMETER, SPECTROMETER, SPECTROPHOTOMETER, SPECTRAL MONITOR, SPECTROFLUORIMETER, (( LIQUID CHROMATOGRAPH, )) TURBIDITY METER, PROCESS CONTROL OPTICAL MONITOR, TLC SCANNER; OPTICAL PROBES FOR ANALYTICAL INSTRUMENTS AND PARTS THEREFOR; OPTICAL FIBRE CABLE FORMS FOR ANALYTICAL INSTRUMENTS