a device is proposed for fastening a post in a terminal clamp , having at least one terminal clamp for connection to a battery terminal , at least one electronics unit or measuring element capable of being connected to the terminal clamp , at least one post for connecting a battery cable , the post being mechanically fastened to the terminal clamp via a connection , and having at least one insulating element between the post and the terminal clamp , means being provided for the rotational securing of the post .