A snap-fit height sensor and a height sensor assembly. The snap-fit height sensor is fixed to a base by means of a mounting support. The height sensor comprises a sensor body and a swing arm capable of swinging relative to the sensor body. An engagement seat is provided on the sensor body, the engagement seat being capable of receiving the mounting support and being fitted and fixed to the mounting support. The snap-fit height sensor and height sensor assembly provided in the present utility model overcome the shortcomings in the prior art, such that the mounting support and sensor have a small mounting volume, a light weight and a low cost, with simple mounting steps, few components and high efficiency.

A measuring device including a support base, a movable arm, having an extension prevailing along a longitudinal direction and rotatable with respect to the support base along a rotation axis skewed with respect to the longitudinal direction, a probe constrained to the movable arm, apparatus for measuring oscillation of the movable arm, first magnet including at least one first magnetic element constrained to the movable arm, at least one second magnetic element constrained to the support base and not oscillating with the movable arm, the first magnetic element and the second magnetic element reciprocally movable along a movement trajectory having prevailing extension along the longitudinal direction, the first magnetic element and the second magnetic element exerting magnetic force on each other in at least one position along the movement trajectory.