Low Temperature circulation control temperature range from -40? or -20? to 120.0?, with internal and external circulation pump. Internal circulation enables precise temperature uniformity in the bath within ± 0.1?. Impeller type external circulation pump enables to circulates chilled water (liquid) to external equipments which needs to be cooled or kept constant temperature. External circulation flow rate is 12 liters/minute and pressure is 250 mbar.