12-digit desktop display calculator features an auto-replay that allows you to check and correct up to 99 previous entries and CSM keys for quick and easy solutions to cost/sell/margin problems. Just enter two-variables and the third appears. Design includes super large fully punctuated 12-digit tilt display and a full-size keyboard with PC touch. Desktop display calculator offers two independent tax keys percent square root key four-key memory backspace key change sign key grand total key and automatic constants. Operates on dual power (solar/battery) with automatic power-down feature. Made with 50 percent recycled plastic.