The Large Sheet In-speck-tor – A4 (LSI-A4) measures dirt specks in pulp and paper according to ISO/CEN 5350-4, TAPPI T563 & Paptac D35 standard methods. The LSI measures the number, size and equivalent black area (EBA) of visible dirt specks far more precisely than the human eye. Operating on flat and smooth sheets, with ISO Brightness >40%, it measures dirt specks on sheets in a single scan. The LSI provides the information you need to assure a high quality product.