The Corning PC-420D stirring hot plate has a durable glass-ceramic 5 x 7 inch (12.7 x 17.8cm) Pyroceram top and digital temperature and stirring speed displays. It is designed to operate on 100V/60Hz with a standard US three-prong plug for use in Japan and other areas with similar electrical requirements. Microprocessor maintains consistent and repeatable temperature settings from 5°C (if ambient temperature is 0°C or lower) up to 550°C. Digital LED temperature display is adjustable in 5°C increments and blinks until set temperature is reached. Optional external temperature controller (available separately) truly controls temperature inside the vessel and eliminates the need to closely monitor liquid temperature. Exclusive closed-loop stirring control monitors and regulates the stirring speed from 60-1150 RPM for aqueous, viscous, or semi-solid solutions. Stronger, larger magnet improves stir bar coupling combined with automatic ramp up speed adjustment minimizes decoupling. Bright LED hot top icon lights up when top plate is over 60°C,even when the unit is turned off. Separate temperature sensor provides power cutoff if unit overheats. Two piece casting design deflects spills away from electronics and includes a built in mount for an optional 18 inch (45.7cm) support rod. This is the suggested replacement for Corning Item Number 6797-420. Number of Stirring Positions: 1. Top Size: 4.25 x 7.55 x 11 Inches (10.8 x 19.7 x 28cm). Top Material: Pyroceram Glass-Ceramic. Stir Range: 60 To 1150 RPM. Power: 100V, 60Hz. Amperage: 6.3. Watts: 623. Dimensions (L x W x H): 4.25 x 7.55 x 11 Inches. Weight: 3.2kg. Corning #: 6797-420D.