The CL-1919 trainer permits to teach the principles of Ohm's law. Electrical circuits can be built by the students and measured using the built-in multimeter. All the components are housed in a metal cabinet with a removable cover. Schematic diagrams and specifications are silk-screened onto the back of the plastic mounting base. A 3-m (10’) power cord is provided with the unit which is protected by a thermomagnetic circuit breaker. Connections to coded 4-mm terminals are made with colour-coded leads.