for maintenance and repair work on the Spheros heaters, there is a diagnostic device that is connected between the heater and PC / laptop, the device can be used for all heaters of the Thermo, Thermo-S and Thermo Plus series, as well as GBW 300 and Thermo G, with it, among other things, the test of the control unit, temperature sensor and the temperature limiter, as well as the readout and clearing of the error memory can be performed. Included in delivery: USB diagnostic adapter, USB cable, operating instructions, adapter harness for Thermo, Thermo G, Thermo Plus and GBW 300, test plug for Thermo S heaters