A golf swing training device is configured to prevent lateral movement of a golfer’s hips such as during the backswing, downswing andor follow-through portions of the golfer’s swing. and a relative humidity of 60% RH. The device comprises an adjusting device, which is actively connected to the supporting device and can be directly or indirectly actuated by a user and which can move the supporting device from a first into a second supporting position. A determination unit determines an arbitrary type of printing medium relatively approximate to the characteristics of the printing medium designated in advance by comparing the characteristic information of each of the plurality of arbitrary types of printing media with the characteristics of the printing medium designated in advance. The first signal and the second signal are compared to obtain the near-field electrical activity at the location in the heart. In some examples, the method may be utilized for quantifying clumping in keratinous materials such as eyelashes when a composition such as mascara is applied thereto.