Abstract: The invention relates to a positioning device for a parallel tester, a parallel tester, and a method for testing a circuit board. According to a first aspect of the invention, a positioning device is provided for fine adjustment purposes, in which the test adapter can be fastened to an inner holding piece of a holding device and the inner holding piece is supported so that it is able to move relative to the rest of the positioning device. As a bearing, only one or more swivel joints and/or one or more air bearings and/or one or more magnetic bearings is/are provided.