While at the Schucks Auto Supply Nationals, I noticed a guy with some kind of tool that he placed on the track surface randomly from the starting line to 60' or so out and was taking notes on whatever reading it was giving. It looked like it had three legs and had some kind of crank that he turned a few times and then wrote down the readings. Anybody know what that was? I've never seen it before. Not sure if he was part of the NHRA track crew or one of the car crews.