Portable protective case for transporting an electrical measuring device, having - an outer shell with internal cladding which encloses an interior space, which is designed to accommodate the measuring device, wherein the interior space has at least one mounting and wherein the at least one mounting is specially designed to accommodate a specific type of measuring device with known dimensions, - a handle, which is designed to enable the protective case to be carried by a user, - a locking mechanism, which is designed to enable the protective case to be opened by a user, - a communication unit integrated into the protective case, in particular in the shell or cladding, - a power supply unit having at least one accumulator for supplying power to the communication unit, and - verification means for verifying a presence and an identity of a measuring device in the interior space, wherein the communication unit is designed - to retrieve data about the presence and identity of the measuring device, - to retrieve and send data via an external wireless network, in particular via a terrestrial or satellite-based wireless network or a local area network, and - to receive localization data that provide at least a rough position of the protective case, wherein the communication unit is designed to exchange data with the measuring device, characterized in that the communication unit is designed to - retrieve data via the wireless network, from which data a known usage location of the measuring device can be determined, - calculate, based on the identified position of the protective case and the known usage location of the measuring device, a time remaining until arrival of the protective case at the usage location, and - based on a calculated time remaining, - to automatically switch on the measuring device and/or - to automatically transmit usage location-related data to the measuring device. - an outer shell with internal cladding which encloses an interior space, which is designed to accommodate the measuring device, wherein the interior space has at least one mounting and wherein the at least one mounting is specially designed to accommodate a specific type of measuring device with known dimensions, - a handle, which is designed to enable the protective case to be carried by a user, - a locking mechanism, which is designed to enable the protective case to be opened by a user, - a communication unit integrated into the protective case, in particular in the shell or cladding, - a power supply unit having at least one accumulator for supplying power to the communication unit, and - verification means for verifying a presence and an identity of a measuring device in the interior space, wherein the communication unit is designed - to retrieve data about the presence and identity of the measuring device, - to retrieve and send data via an external wireless network, in particular via a terrestrial or satellite-based wireless network or a local area network, and - to receive localization data that provide at least a rough position of the protective case, wherein the communication unit is designed to exchange data with the measuring device, characterized in that the communication unit is designed to - retrieve data via the wireless network, from which data a known usage location of the measuring device can be determined, - calculate, based on the identified position of the protective case and the known usage location of the measuring device, a time remaining until arrival of the protective case at the usage location, and - based on a calculated time remaining, - to automatically switch on the measuring device and/or - to automatically transmit usage location-related data to the measuring device. - to automatically switch on the measuring device and/or - to automatically transmit usage location-related data to the measuring device.