This sealed ‘window’ unit contains iron filings suspended in a special clear fluid that allows free movements and prevents coagulation. The filings adopt a clear field pattern when magnets are brought into proximity. The viewer is supplied complete with four magnets but it can also be used with other magnets such as the rare earth range. It will sit neatly on an OHP to project the field pattern(s).
Size: 245 x 175mm approx.