Ключевые слова: amplifier, background, cable, check, conductor, connection, contact, danger, digital, display, electric, electrical, electrician, electricity, electronic, equipment, flow, high, instrument, isolate, isolated, isolation, lamp, light, measure, measurement, metal, metallic, meter, neon, power, probe, screw, screwdriver, technician, technology, test, tester, tool, type, volt, voltage, white, wire,