Calculator EL-W531XHGR. Number of functions: 335. For secondary school, SEK I. Approved in all federal states. The large display allows fractions, roots, and formulas to be entered in the same order as students write them in their notebooks. The display resembles that of a textbook. The display mode can be switched from WriteView to Line mode, similar to standard calculators. The multiline playback function allows users to recall, modify, and compare entries. The Change key converts a fraction into a mixed number or a decimal with a single press. It covers all scientific functions needed in school, such as statistics (1 & 2 variables, 7 regressions), nBase calculations (dec, hex, oct, bin, pen), and logical operators. Power supply: 1xAAA. Dimensions (W x H x D): 80 x 168 x 14 mm. Weight: 103 g. Display type: four-line display with a 96 x 32 dot matrix. Color: black/green.