Hand-operated AC and DC generator: a teaching instrument, simple to operate, highly practical, and meticulously crafted.Intuitive demonstration, good verification, turning boring text into experiments, is a good helper for understanding, learning and interesting teaching.Meticulous craftsmanship, smooth edges, stable base.Product name:Hand cranked AC and DC generatorProduct features:easy to use, stable performance, intuitive demonstration, easy to operateScope of application:Mainly used in middle school physics teaching demonstration laboratories, and can also be used by colleges and universities, scientific research institutions, electronic product manufacturers and maintenance unitsColour:As ShownMaterial:Metal+Plastic+Wood+MagnetSize:29x18cmPackage Contents:1 * hand generatorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.