Tall, heavy-walled glass vessels coated with Instatherm® to accommodate larger and taller vessels. A thermocouple well is imbedded in the insulation. Designed to operate at up to 250 degrees C. Do not run dry or above max voltage. Bare, flat bottom suitable for use with magnetic stirrers. All baths include a connecting controller cord (9698-20). 300mL size is low voltage and requires a variable voltage output control, while other sizes operate with 120v controls.