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 . <EOS>