Rheostat 400 ohms 0.5 Amp. 8-inch Great classroom demonstration tool. This is excellent for providing hands-on understanding. Ni Chrome & Eureka wire is wound on a vitreous enameled tube. The sliding contact carriage, mounted on the slide bar, carries a phosphor bronze contact for a long life. Labtex offers the best price, quality, and quick service for all types of Rheostat in Bangladesh.