Abstract: A stand for a pipet controller includes a housing with a cradle arranged to hold a pipet controller in at least three distinct orientations relative to the housing. The at least three distinct orientations include a first orientation for storing the pipet controller when not in use, a second orientation for storing the pipet controller between intermittent uses such that a grip of the pipet controller is able to be ergonomically gripped by a user of the pipet controller, and a third orientation for storing the pipet controller such that, if a pipet is connected to a pipet connector of the pipet controller, the connected pipet does not contact the stand nor a surface supporting the base of the stand. The stand can also be a charger for charging the pipet controller in at least one orientation.

Abstract: A head body h1 includes a recess part 14 for a socket. A socket 10 is attached to the recess part 14 for a socket. A weight body 12 is detachably attached to the socket 10. The weight body 12 can be secured by relative rotation of an angle +?°. The weight body 12 can be detached by relative rotation of an angle??°. The weight body 12 includes an engaging part 32. The socket 10 includes a first hole part 18 and a second hole part 20. The engaging part 32 can take an engaging position EP and a non-engaging position NP at the second hole part 20 by the relative rotations. A sectional shape of the engaging part 32 has N-fold rotation symmetry. N is an integer of 1 or greater and 3 or less.