Corning® Hot Plate/Stirrers have been a laboratory standard for many years. Microprocessor control combined with hi-tech insulation makes these hot plate/stirrers fast, consistent, and energy efficient. Easy-to-read controls allow precise settings. Corning's exclusive glass-ceramic Pyroceram® top, is easy to clean and resistant to corrosion and chemical attack. The stir range for each model is 60 to 1,100 rpm. All models are UL® approved and carry a 2-year warranty. Top size measures 4 x 5".