Microprocessor control provides superb linear control of heating in the range of 25-550°C. Extra large knobs with easy to read numbers. A hot top indicator light warns that the top is too hot to touch (>60°C). Includes a socket for an optional external temperature controller, for temperature stability of samples ± 2°C. Meets UL, CUL. IEC1010 and CE standards. For 110V, 60Hz.