The Rex 4000-D Digital Durometer RX-4000-D Type D (Shore D) with 18mm Diameter Footer is the perfect instrument for use on the production floor or in the lab for measuring the hardness (Durometer) of rubber and plastic parts. It features an over-sized 18mm footer, large LCD display with USB output. Available models include RX-4000-A for Rubber Parts and RX-4000-D for plastic parts. The Model 4000 Digital Durometer is supplied in a foam-fitted carry case along with an NIST-Traceable Calibration Certificate.