12digit heavyduty printing calculator with equalsplus logic features a large, twocolor backlit display with negative numbers in red Design includes large, wellspaced contoured keys with PC Touch and leftside total key Print 40 lines per second in two colors Calculator delivers large print on paper tape Enter two costsellmargin variables, the third appears and prints Functions also include tax set and tax , fourkey independent memory, change sign key, delta percent, grand total key, item count, add mode, datenonadd and automatic constants Calculator runs on AC power