Air laser particle counter of air pump sampling device disadvantage

Air particle counter of air pump sampling device disadvantage:
Some manufacturers are using air pump, the noise big, the life is short,
straight the impact product performance.Some manufacturers use ordinary fan,
life 20000 hours, the air is not stable, long-term use after the data appear large deviation.

But Lanjia handheld particle counter use laser sensor with high quality and more accurate test value.