(6) A. Permanently fixed, spring-loaded, specially designed base with moveable contact which transmits the measurement to the indicator. Contains a spherical ring segment whose size is determined by the range.
B. Interchangeable, spring-loaded base with fixed contact. This base has a self-centering contact surface with a spherical ring segment made to your specifications for one specific dimension. You can order additional interchangeable bases for other specific dimensions within the same range.