I received this device at no charge from a relative's estate sale, so in good conscience, I cannot sell it. It is available to you at no charge. I only ask you to pay for shipping from Ashland City, Tennessee. The 1310B is an oscillator from General Radio. An electronic oscillator is a circuit that converts direct current to an alternating current signal. Oscillators generate a periodic electronic signal, often in the form of sine or square waves. Engineers use oscillators on a variety of electronic devices.