I have both... Use the digital at home and the bubble at the track if I tear up the front end. Too many times the trailer is unattended at the track and I'm afraid the digital will grow legs. If we tear off a right front, on our set-up sheets the number of threads showing is noted for all tie rods radius, control arms and ball joints. Lotsa times in the pits the ground is not level and I am too lazy to level the trailer every trip to the track. once again we reference the thread count....
----- Gimpster -----