Impact Testing System They are accordance with International Standard ISO148-1983 & ASTM E23. & mainly used to determine the anti-impact capability of metal materials under dynamic load.They are the best testing equipment for many metal material manufactories, quality inspection departments and universities. The result will display on both digital screen and dial gauge. JBW Series can Carry out the functions of clear zero and return automatically, capture the value of lost impact energy and pendulum cycle by means of setting up with computer program, and the result can be displayed, stored and printed out. Nist calibration certification