About this item Maintenance-Free Pump: maintenance-free pressure/suction pump, resistant to fibers and metallic particulate matter, while allowing horizontal and vertical agitation of the bath for more uniform mixing Multiple safety protections: low level protection, with simultaneous light and sound alerts in case of alarm Durable Materials: the pump components that come into contact with liquid or steam are made of high-performance stainless steel and plastic Temperature Sensor: Pt100 temperature sensor with single-point and two-point temperature calibration Internal Circulation: with two different heights of cup holders as standard for different cups in the bath for constant temperature and viscosity testing External Circulation: with constant temperature for the water bath jacket of the viscometer, suitable for sample viscosity testing with the viscometer in the water bath jacket outside the bath Adjustable Buzzer: the buzzer can be set to be silent or audible