Water Bath ( Thermostatic), Double walled in construction. Inner chamber SS and outer made of M.S. with powder coating, Temp. range 5°c above ambient to 95oc accuracy + 2oc. Temp. controlled by capillary type thermostat. Top lid with concentric rings made of stainless steel. The gap between the inner and outer chamber filled with glass wool insulation to minimize heat loss. Immersion type Heater should be provided. Long lasting elements Concentric rings to use flask from 50 ml to 500 ml capacity.