Cathode-ray tube Voltmeter manufactured by the firm TECH, it is model number TE-65. Comes from the collection of a professor of electronics. Cathode-ray tube voltmeters have a number of advantages over voltmeters based on semiconductor components: They can measure very high and low voltages. They do not interfere with the circuit that is being measured. They are not affected by magnetic fields Has not been tested. Measurements are: 23 cm x 14 cm x 14 cm. Weight: 2.2 kg. Please take a good look at the photos, these are an integral part of the description of this lot. Will be carefully packaged and shipped with Track and Trace.