Global Fibre Optic Spectrometers Market By Type (by Light Sources: LED , UV-VIS-NIR , Laser , by Accessories: Radiometry Accessories , Cuvette Holders , Probes , Fibre Optic Cables , and Other), By Application (Color Measurement , Spectral Measurement , Film Thickness Measurement , and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029