Medical or dental treatment device and tool for such a treatment device

A medical or dental treatment device comprising:

• a first tool, of a plurality of tools, having a first portion, a second portion and a tool shaft, wherein the first portion of the first tool is an electrically conductive identification element and the second portion of the first tool is an electrically conductive identification element, wherein the first and second electrically conductive identification elements are distinct elements which are arranged on the tool shaft;
• a tool retainer for connecting to the first tool,
• a control unit to induce a first periodic or sinusoidal measurement signal of the first portion of the first tool and a second periodic or sinusoidal measurement signal of the second portion of the first tool, wherein the control unit comprises an electrical energy supply device and an evaluation device, and
• a first measuring coil and a second measuring coil which are connected to the electrical energy supply device via electrical lines, wherein
• while the first tool is retained in the tool retainer, the electrical energy supply device supplies the first measuring coil with a first periodic or sinusoidal electrical energy supply and the second measuring coil with a second periodic or sinusoidal electrical energy supply, so that the first periodic or sinusoidal measurement signal is produced due to inductive coupling between the first portion of the first tool and the first measuring coil and the second periodic or sinusoidal measurement signal is produced due to inductive coupling between the second portion of the first tool and the second measuring coil, wherein the first and second periodic or sinusoidal measurement signals are distinct signals, and wherein
• the evaluation device electrically connected to the first and second measuring coils detects that the first tool of the plurality of tools is connected to the tool retainer based on the first and second periodic or sinusoidal measurement signals which together are specific to the first tool and which are assignable to the first tool by the evaluation device.