... of gold, sliver, copper, aluminum, material and ect.Melting Electric Furnace, Melting Furnace, Energy-saving Furnance, Efficiency Furnance.main characteristics ... generator, higher reliability can be achieved;2.Small size and portable , compared with SCR controlled machine, only 1/10 working ... the scope of full power.4.With wide frequency range from 1-20KHZ automatic trackin ability, no need adjustment ...