extra Heavy-duty Printing Calculator With Built-in Paper Arm Prints 4.6 Lines Per Second In Two Colors. 12-digit Fluorescent Display Has 17mm Tall Display Digits For Easy Viewing. Design Also Includes Large, Well-spaced Contoured Keys. Functions Include Two Independent Tax Registers, Four-key Memory, Item Count, Delta Percent Of Change, Grand Total, Sigma, Date/nonadd Key And Subtotal Key. Cost-sell-margin Keys Allow You To Quickly And Easily Solve Cost-sell-margin Problems By Entering Two Variables, And The Third Appears And Prints. Calculator Weighs 3 Lb.