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Have you ever wondered why the control button of your manual pipette is as long as it is? Good control button ergonomics provides for a design which is as short as possible so that the thumb does not have a long working distance, yet as long as necessary so that good liquid level control is ensured. The working distance of the thumb is influenced by the length of the control button, the position of the hand rest on the handle and the handle thickness. You guessed it: the ergonomics of a pipette is surprisingly complex!