There are no extra parts to worry about. The Gripper can adapt to 5 Cable sizes 1/16, 3/32, 1/8, 5/32, and 3/16. From 5 to 150lb’s. 1%-2% Accuracy. An instrument that will pay for it self quickly. The time savings compared to your current tool will amaze you. Electronically measured readings, assures accurate, reliable and repeatable measurements every time you use the “Gripper”. The Gripper heads small size (1 1/8” square by 4 1/8" long ) lets you access tight areas as it will go where other just will not go. It comes to you calibrated and ready for use.