A large cast aluminum top plate provides an even heating surface. Electronic speed control and bimetallic thermostat deliver reliable and repeatable results. Powerful heater reaches maximum temperature in minutes. Large magnet provides strong magnetic coupling to the spin bar. Indicator lights illuminate when unit is on.. Large 16.5 cm (61/2") diameter Cast aluminum top plate. Stirs from 100 to 1600 rpm. Heats up to 400°C (752°F). 1500 mL capacity. . VWR 12620-970 Dyla-Dual Hot Plate Stirrer, 165mm Diameter, 1500mL Capacity. Country of Origin : United States. Part Number : 1173F46EA. Pack of : 1.