What are those heating plates called that have a magnetic stirrer?
I’m trying to find out what those heating plates are called that are found in chemistry labs. From the top view they have 5 rings equally distributed, and each ring creates a small magnetic field. They are sometimes used to place vials on top. What are they called? Thank you! 
they are called magnetic stirrers or heated stirrers or heater-stirrers. You’ll find them in the thomas catalog:
http://www.thomassci.com/catalog/product/14441
The part number is 5979J48
ThermoFisher has them too
http://www.thermo.com/com/cda/products/all_products/0,1061,10134205,00.html
Part number SP135935Q