Humidifier purchase tips 1.Humidifying area The humidifier has a rated humidification capacity, which refers to the number of milliliters of water that can be atomized per hour. The humidifier or the manual also indicates its suitable humidification area.Generally speaking, 200ml/h humidifier is suitable for room size of 25-30㎡.If you see that the rated humidification of some brands is 300ml/h, the applicable range is 50m2, then you don't need to consider that product, please turn around and leave immediately.