Device for registering an On state (On) of a drive motor (2, 3) of a tool, wherein the device is designed for arrangement on the tool, wherein a changing magnetic flux is produced in the On state (On) of the drive motor (2, 3), wherein the device has: - an inductive sensor, wherein the inductive sensor is designed so that a voltage signal is induced in the inductive sensor on the basis of the changing magnetic flux, - a capacitor, wherein the capacitor is electrically connected to the inductive sensor, - an amplifier, wherein the amplifier is designed to amplify the induced voltage signal or a signal based on the voltage signal to produce an output voltage signal, - a first peak hold detector and a second peak hold detector, wherein the first peak hold detector is designed to generate an upper peak signal from the output voltage signal or a signal based on the output voltage signal, and wherein the second peak hold detector is designed to generate a lower peak signal from the output voltage signal or the signal based on the output voltage signal, - an evaluation device, wherein the evaluation device is designed to form a difference from the generated upper peak signal and the generated lower peak signal, to compare the formed difference or a quantity based on the formed difference with an adjustable threshold value, wherein the threshold value is software-based, and to determine the On state (On) of the drive motor (2, 3) when the threshold value is reached or exceeded, and - a communication interface, wherein the communication interface is designed to send the determined On state and/or operating data based on the On state (On) wirelessly to a terminal, and wherein the communication interface is designed to receive a setting for the threshold value wirelessly. - an inductive sensor, wherein the inductive sensor is designed so that a voltage signal is induced in the inductive sensor on the basis of the changing magnetic flux, - a capacitor, wherein the capacitor is electrically connected to the inductive sensor, - an amplifier, wherein the amplifier is designed to amplify the induced voltage signal or a signal based on the voltage signal to produce an output voltage signal, - a first peak hold detector and a second peak hold detector, wherein the first peak hold detector is designed to generate an upper peak signal from the output voltage signal or a signal based on the output voltage signal, and wherein the second peak hold detector is designed to generate a lower peak signal from the output voltage signal or the signal based on the output voltage signal, - an evaluation device, wherein the evaluation device is designed to form a difference from the generated upper peak signal and the generated lower peak signal, to compare the formed difference or a quantity based on the formed difference with an adjustable threshold value, wherein the threshold value is software-based, and to determine the On state (On) of the drive motor (2, 3) when the threshold value is reached or exceeded, and - a communication interface, wherein the communication interface is designed to send the determined On state and/or operating data based on the On state (On) wirelessly to a terminal, and wherein the communication interface is designed to receive a setting for the threshold value wirelessly.