They get expensive. Some of the torque heads get into the hundreds. It was a freaking *** pain. They had to come in the temp/humidity controlled room, then soak for 24 hours then calibrated and adjusted if needed. Never got the soak part because half the time you took it from the shop out in 30 degree temps and used it. I remember one day a guy dropped a box full of them and all of them had to re calibrated. He worked that weekend! You want to buy a good snap on one for half the price CDI is the manufacturer of them.