The Comparator System is based on a versatile 2-field visual comparator with an optional lighting unit to guarantee correct lighting conditions for color grading and colorimetric analysis.The sample color is visually matched in the comparator instrument against graded coloured glass filters in Lovibond® test discs. A wide selection of discs is available.Nessleriser systems are longer path length instruments for measuring unsaturated samples that are below the sensitivity of the standard Comparator