Solar Desktop unit is a big-digit desktop calculator which features arithmetic functions (add, subtract, multiply, divide), percent, 3-key memory, square root, and floating decimal point. Solar-powered unit can be read in any light. Performs chain calculations. Jumbo, 1/2 inch high digits allow effortless readings even with your glasses off. Oversized keys and perfect spacing are easy on the fingers. Tough ABS plastic case is ideal for rough lab use. Feet protect the unit from spills. Supplied complete with instructions. Size is 4-1/2 x 4-3/4 x 1/2 inches. Weight is 4 ounces.