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). Codes -20 thru -24 include a thermocouple/thermometer holding clip in addition to the 9698-20 cord.