FEATURES:
The unit comes with an integrated alpha "numeric digital display, and control panel. You can switch between standard or metric units.
Automatic calculation of mean rebound number, compressive strength and more;
Field Printer, PC connection and software for downloading.
Connection to a personal computer is via the RS-232 interface.
Conforms to ASTM C-805, BS-1881-202, IS 13311 Part 1
Construction: All Aluminum for rugged construction environment
Operating Temperature: 0° to 50° C (32° to 122° F)
Approximate weight: 1.6 kg (3.5 lbs.)
Travel carry case
originally found here:- http://www.reboundhammer.com/digital-rebound-hammer.html#dig