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Thermistor bridge "M4-2" was produced presumably since 1965. It was part of the power meter "M3-10", but was supplied separately. Serves for measuring low power continuous and pulsed modulated microwave oscillations using thermistor heads. The frequency range in which measurements can be made is determined by the heads. Measurement limits: 150; 500; 1500; 5000; 7,500 uW The principle of operation is based on the automatic replacement of the absorbed power by the microwave power of direct current, equivalent to the thermal effect on the measuring operating thermistor.