Compared with the large vacuum pump, it has the following advantages:
Small size, low noise, low power consumption, easy to operate, easy to carry, maintenance free, continuous operation for 24 hours, also allows medium rich in water vapor. Most importantly, because it is dry, oil-free, no vacuum pump oil or lubricating oil, so it will not pollute the working medium, will not interfere with the analysis of the media and so on. And the price is much cheaper.