12-digit desktop display calculator features an auto-replay that allows you to check and correct up to 99 previous entries. CSM keys allow quick, easy solutions to cost/sell/margin problems. Simply enter two variables, and the third appears. Design includes super large, fully punctuated tilt display and a full-size keyboard with PC touch. Functions include two independent tax keys, percent, square root key, four-key memory, backspace key, change sign key, grand total key and automatic constants. Desktop display calculator operates on dual power (solar/battery) with automatic power-down feature. Calculator is made with a high percentage of recycled material.