These hot plates have a 4 x 5 inch glass-ceramic PyroceramŪ top and offer superior performance and reliability in a low profile, space-saving design. Advanced insulation technology conserves energy by keeping heat safely at the top where it belongs. Effective two-piece casting design deflects spills from electronics, which are enclosed for improved performance and durability. Heating is microprocessor controlled and passes FCC regulations for Electromagnetic Interference (EMI). Hot top indicator light blinks a warning if the top is too hot to touch (>140°F) - even when the unit is turned off. Easy-to-read numbers simplify measurements, and rugged, extra-large knobs provide greater control for gloved fingers. Flatter, whiter PyroceramŪ top conducts heat more efficiently and evenly. Built-in holder accommodates optional support rods (No. 400084). Worldwide regulatory approval-UL, CUL, IEC 1010, CE, and GS approved. Two-year warranty