I have a PH10MQ with a TP200 sensor on it and the SCR200 rack. On a semi regular basis an operator or engineer will manage a significant crash to the point that I get an over force message on the PH10. We have two full DCC machines and both have a program for checking the calibrations of the probe after they are calibrated. The limits of the check program are the calibration certification values of the two machines (.008 mm and .011 mm). Our experience is that in most (not all) cases after a significant crash of the PH10 the calibrations still report within the tolerances listed in the check program. The only thing that we have found is that if the crash was significant enough to bend the probe the calibrations will be out of tolerance. Typically we can run three or four days without having to re-qualify the probes and just use the checking program to keep everything honest. We run 3/5 8 hour shifts a week and these are mature machines and programs.