(1) Check the electromagnetic wave shielding performance of the generator, which should not affect the normal use of nearby radios and televisions. When purchasing, you can bring a small semiconductor radio, which should not be disturbed at a distance of 30 cm from the working anion generator.

(2) With the back of your hand close to the outlet of the anion generator 20 cm away, you will feel a cool breeze, which is negative ion wind. It smells and has no taste, negative ions have no taste and no color.

(3) Identification of ozone content. At 0.3 meters, there should be no ozone smell (similar to the smell of wheat grass, fishy smell), or no dizziness after smelling it for a few minutes.

(4) Put a new plastic film food bag on the hand. When the hand is close to the outlet of the generator with good performance, negative ions are sprayed on the food bag to generate electrostatic attraction, and the plastic bag will stick tightly to the hand. Even if the anion generator is turned off, the accumulated charge will not disappear immediately, and the phenomenon of hand suction will last for a while; products with poor performance do not have this phenomenon.

(5) The best distance for breathing negative ions is 30-35 cm away from the generator outlet. The vertical anion generator is best placed away from the wall in a spacious and unobstructed place.