These instruments measure the color of solid and liquid samples using either a fiber optic reflectance probe, fixture, dip probe, or cuvette holder. The StellarNet BLACK-Comet-CXR colorimeter has consistent resolution throughout 280-900nm and is a perfect low cost instrument for any color measurement application. As one of StellarNet's concave grating models it has low stray light levels because there are no mirrors in its optical bench. It is engineered with no moving parts which results in shock proof durability, permanent alignment, and a ruggedness unmatched by any spectrometer in its field. The BLACK-Comet-CXR reliably measures CIELAB & Delta E* values. StellarNet's BLACK-Comet-CXR colorimeter is applicable for color measurements of food, beverages, industrial and home liquids, textiles, plastics, pharmaceuticals, and raw materials.