'Adding Machine 10Key Univ Lite' is a versatile calculator app that behaves like a true '10 Key' or 'printing calculator'. It offers the functionality of popular calculators made by Monroe, Casio, Sharp, and others. The app allows you to obtain a total by pressing the asterisk (*), reverse operator entry, and calculate percentages by multiplying and adding to a stream of numbers.

This universal version of the app works seamlessly on both iPhone and iPad. The iPad version features a full-sized keypad with TypeTone, an innovative audio aid that helps guide your finger back to the center of a key. Additionally, the position of the total (*) key can be customized to suit your preference, whether it's on the left or right side.

With 'Adding Machine 10Key Univ Lite', you can easily review and edit numbers, add or delete lines, and save and retrieve paper tape files. The app also allows you to export paper tape files to iBooks, Dropbox, email, or your favorite printing utility.

Please note that this is the free version of the app, which has a reduced number of paper tape lines and some limitations. The full version can be found by searching for 'Adding Machine 10Key Univ' by Richard Silverman in the App Store.