The macro cell, which is defined by DIN 58963 as a rectangular cell with an inner width greater than 5 mm,
has emerged as the standard for photometry. The most widely used macro cell is a rectangular cell with
outer dimensions of 45 x 12.5 mm (height x width). The length of the cell is dependent on the desired path
length. Macro or standard cells have about the same wall thickness on all sides, and are used for most
liquid UV-Vis and UV-Vis-NIR measurements. They require the largest sample size for a given path length.