Laser particle counter, powerful, stable and reliable, accurate testing. It can detect and transmit the number of particle pollutants, temperature, humidity, etc. flowing through each particle size section of the liquid online and in real time. A variety of standards are available, providing the corresponding pollution level. and emit a warning signal when the pollution is too high or too low. Anti-bubble interference type, through the pump group pressurized compression bubbles, to eliminate interference, has obtained the actual pollution situation. It can be applied to the condition that the sample contains a large number of air bubbles.