The HJ-4A digital thermostat magnetic stirrer is a quadruple multi-head magnetic stirrer, which is an ideal instrument for heating and stirring liquid analysis. It has the advantages of unique constant temperature automatic control and adjustment. Using DC brushless motor, low noise, less mechanical failure, stable speed regulation. The stir bar made of fluorine material and high-quality magnetic steel has the characteristics of high temperature resistance, abrasion resistance, chemical corrosion resistance, and strong rotation force. It can be mixed in a sealed container. It is ideal and convenient to use.