There's a couple of different Impact Sensor devices such as Shockwatch or G-Force that you can buy from any of your local forklift dealers. It depends on how in-depth you want to get as to which of either one of these that you are interested in. Either one can show you at the time of impact, who was operating lift, how hard the impact was. You can also have them completely shut down the machine and have to be reset by supervisor. Also either one can give you fleet reports too.