The EchoTherm Model HS65 Programmable Digital Stirring Hot Plate with 5-Stirring Positions is intended for use in chemical, pharmaceutical, environmental, biochemical, and other laboratories where reproducible, accurate, hands-off sample preparation and experimentation are required. Programming is done through the front panel membrane switch and custom liquid crystal display. Heater plates are 12 by 12 in. white, solid ceramic glass for chemical resistance and quick heating. Stirring speed is 100 to 1500 rpm and is controlled by optical coupler to 10 rpm.