Constructed of stainless steel and supplied with 1-6 recesses, each fitted with a metal clad element specially designed for efficient heating and minimum effect from liquid spillage. Each element is controlled by an energy regulator and heating is indicated by a pilot light. Two refractory rings are supplied for each recess to accept from 100-500 ml capacity flasks. All multiple units include an adjustable stainless steel flask support. Without glassware. For use on 220-260V 50-60Hz.