The invention relates to a lab stirrer, in particular to an overhead stirrer, having a stirring unit and having a stirring member which can be rotatingly driven by the stirring unit and is provided for immersion into a medium to be stirred, with the stirring member being provided with at least one measurement sensor for the measurement of measurement data of a measurement parameter of the medium. The stirring member is provided with a measurement circuit which includes a data transmission device to transmit the measurement data in a contactless manner to a receiver unit not rotating with the stirring member.