HR-10RC Portable printing calculator with a large easy-to-read display and a host of features. DR-270R Heavy Duty Desktop Printing Calculator with an extra large 12-digit display that prints 4.8 lines per second and in 2 colors. HR-170RC Mini desktop printing calculator with a big easy-to-read display and prints 2.0 lines per second with 2-Color printing and Cost/Sell/Margin functionality.