The Ground Splitter is used to connect two ground cables (EXG Ground) to a single NeXus system.
With this cable you can connect two people to one NeXus for doing EXG (EMG/ECG/EOG/EEG).
Please note that by splitting the ground the noise level on your signal will increase. If you use peripheral (AUX) sensors, you can connect as many people as there are AUX channels available (E.g. 4 respiration sensors in NeXus-10), this will not influence signal quality.