Casio HR-170RC Compact with 150 Step Check and EditCASIO's HR 170RC Portable printing calculator features several unique features. The "150 Step Check & edit" function provides easy review and correcting of numbers without the need to re entering all your numbers if you make a mistake. The "After Print Function" provides the option to print the record of the calculation entries after all operations (max. 150 operation steps) are entered). Re Print Function is the option to print a calculation (max.