Corning hot plates with the glass-ceramic PyroceramŪ top have digital temperature displays. Closed-loop heating controls and microprocessor maintain 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. Bright LED HOT TOP icon lights up when top plate is over 60°C, even when heat control 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" (45.7cm) support rod (Cat. No. 440129). Optional external temperature controller (Cat. No. 6795PR) truly controls temperature inside the vessel and eliminates the need to closely monitor liquid temperature. 120V/60Hz models come with standard US three-prong plug for use in North America and other areas with similar electrical requirements. 230/50Hz models come with United Kingdom plug. UL and CUL approved.