Device for coating a metallic strip substrate on one side and/or both sides, comprising: - at least one guide device for guiding the strip substrate along a predetermined movement path during the coating; - at least one first coating device for coating a first main side of the strip substrate with an electrostatically charged coating powder stored in fluidised form in a first container, wherein the first container is arranged at least partly geodetically below a first path section of the movement path; - at least one second coating device for coating a second main side of the strip substrate with an electrostatically charged coating powder stored in fluidised form in a second container, wherein the second coating device is downstream of the first coating device with respect to a direction of running of the strip substrate along the movement path; and - at least one deflecting unit, which is switched with respect to the movement path between the first coating device and the second coating device, for deflecting the strip substrate, wherein the first path section goes over by way of the deflecting unit into a second path section of the movement path, wherein the deflecting unit deflects the strip substrate in such a way that the strip substrate in the second path section runs oppositely to the strip substrate in the first path section and wherein the second container is arranged at least in part geodetically below the second path section, characterised by - at least one measuring device (21, 22) for contactless measuring of the coating thickness produced by the respective coating device (5, 9), wherein the measuring device (21, 22) is downstream of the respective coating device (5, 9), wherein - at least one stabilising roller (16, 17) is upstream of at least one coating device (5, 9) and - at least one regulating device, which is connected with the measuring device (21, 22) and which regulates operation and/or positioning of at least one coating device (5, 9) and/or positioning of the stabilising roller (16, 17) in dependence on a target coating thickness and the measurement data produced by the measuring device (21, 22). - at least one guide device for guiding the strip substrate along a predetermined movement path during the coating; - at least one first coating device for coating a first main side of the strip substrate with an electrostatically charged coating powder stored in fluidised form in a first container, wherein the first container is arranged at least partly geodetically below a first path section of the movement path; - at least one second coating device for coating a second main side of the strip substrate with an electrostatically charged coating powder stored in fluidised form in a second container, wherein the second coating device is downstream of the first coating device with respect to a direction of running of the strip substrate along the movement path; and - at least one deflecting unit, which is switched with respect to the movement path between the first coating device and the second coating device, for deflecting the strip substrate, wherein the first path section goes over by way of the deflecting unit into a second path section of the movement path, wherein the deflecting unit deflects the strip substrate in such a way that the strip substrate in the second path section runs oppositely to the strip substrate in the first path section and wherein the second container is arranged at least in part geodetically below the second path section, - at least one measuring device (21, 22) for contactless measuring of the coating thickness produced by the respective coating device (5, 9), wherein the measuring device (21, 22) is downstream of the respective coating device (5, 9), wherein - at least one stabilising roller (16, 17) is upstream of at least one coating device (5, 9) and - at least one regulating device, which is connected with the measuring device (21, 22) and which regulates operation and/or positioning of at least one coating device (5, 9) and/or positioning of the stabilising roller (16, 17) in dependence on a target coating thickness and the measurement data produced by the measuring device (21, 22).