I attached it to the dial gauge 321 - 131 D made of a monotalou attached to the deflection base of the bicycle wheel. Since the mounting thread of the probe is common to Mitutoyo M 2.5 (P = 0.45) x 5 mm, mounting of various measuring elements is possible. However, because it is out of warranty, installation is at your own risk! The movement traces the side of the wheel smoothly. Since the roller diameter is as small as 10 mm and also has a curved surface of R 5 in the lateral direction, it is point contact and if there is a scratch on the wheel, it will be incorrectly measured as a shake, but smooth motion will make the shake removal work funny It will be. It is recommended for those who have a runout base and dial gauge.