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✔Package Content: Includes 2 primary coil, 2 secondary coil and 2 Magnetic iron core. ✔Theory: Transformer Theory, It can fit for Use with a Galvanometer. ✔Function: Specially designed to Demonstrate electromagnetic induction and Lenz's law for students, ideal for physics teaching. ✔Durable: Construction with Enameled Copper, sturdy and durable. ✔100% Satisfied Service: Enjoy a smooth&worry-free return service within a month. Any questions feel free to contact us, we will be here for you.