The Rex DD-3 Digital Durometer is the successor to the popular Rex DD-1. With its impressive list of features, the DD-3 is truly state-of-the-art, and is the ideal instrument for lab use. Some of the new features are: a new, larger direct drive LCD display, RS232 data ports for computer compatibility, a locking feature to prevent accidental erasure of tolerances, automatic shutoff, low battery warning, and new accessories such as MTI and SPC type printers, audio attachments and software.