It comes with 2 checkers, Made In Japan, High precise and quality ! One of the best in the world only! with Famous Enomoto Branded！ One is 1.97mm for hollow shaft, Another one is 1.99mm for Reinforce shaft. This checker only compatible with current shaft model. The old 90s, or early year of 2000 will not be compatible!
Click the video link below for instruction from Enomoto Shop