Position indicator of the movements of bodies or elements of a tool machine, of the type comprising a numerator body (1), enclosed above and laterally in a carter (2) and below by a base (7), said body (1) providing a central bush (3) for the housing of a shaft, a position viewing screen (4), an electronic printed circuit (9) to which a magnetic ring (11) is connected, provided on said shaft and associated with a pair of reading sensors of the movement of said ring (11), a compartment (10) for the housing of a battery (6) powering said electronic printed circuit (9) and a frame (12) protecting the elements within said body (1), on the top of which an upturned-base bush (13) is kept in engagement, characterized in that there are provided means for the perfect sealing from dust and from temporary immersion in water.