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Note: The sound gets significantly better from 1:20. Explanatory video at school level with the following (clickable) chapters: 0:05 Getting to know the device during a real measurement 1:02 Structure of the device (view and circuit diagram) 2:46 Penetration of the particle leads to the onset of current flow 4:57 Model circuit with voltage measurements 7:12 Gas flow model for understanding voltage developments 9:40 The process in the counter tube continues 11:20 Voltage-time diagrams Target group: Secondary I and Secondary II (grammar school, comprehensive school, middle school, ...)