Thermolyne S 17415, with these features: 4" diameter, 12.5 sq. in. aluminum stirring surface, perforated enamel-finished steel case, low profile 3" height, extra strong magnetic coupling, stirring motor designed for continuous operation. Supplied with one teflon-coated 1" stir bar. 120V, .15A, 17W, stirring speed rpm: 60-1000.