Low Temperature circulation control temperature range from -40? or -20? to 90.0?, with internal and external high pressure circulation pump. Internal circulation enables precise temperature uniformity in the bath within ± 0.1?. Magnetic driven external circulation pump enables to circulates chilled water (liquid) to external equipments which need to be cooled or kept constant temperature. External circulation flow rate is 7 liters/minute and pressure is 450 mbar.