Magnetic Stir Plate. Great for making yeast starters. Sophisticated electronic technology. Manufactured to rigid specifications. Speed adjustment between 100-800 rpm depending upon load. 1 liter capacity. Size is 4.7" x 4.7" x 1.8". Warranty is two years parts and labor. Plastic top. Beakers sold seperately. Made by Hanna. Includes one stir bar.