The following indicators can be used to identify the quality of the negative ion generator: 1. Low electromagnetic radiation: check the electromagnetic shielding performance of the generator, which should not affect the normal use of nearby radios and televisions. You can bring a small transistor radio when you buy it, and don't be disturbed 30 cm away from the working negative ion generator. 2. According to the principle that the work done by gravity between positive and negative electrodes can be converted into electric energy, put the negative ion generator in the center of a spacious house and let it work (don't put other objects around). The tester holds one end of the new 8-watt fluorescent lamp in one hand, rubs the lamp back and forth with a piece of dry wire in the other hand, and then puts the other end of the lamp near the outlet of the generator. If the lamp tube can turn white and shine at 30-50 cm, it proves that the generator has good performance. If it must emit light at 5- 10 cm, it proves that the performance of the generator is poor. If the lamp tube rubbed repeatedly by the wire does not flicker directly near the generator outlet, it shows that the product can hardly play a medical and health care role. 3. There is no static electricity. With the back of your hand near the exit of the negative ion generator 10 cm, there will be a cool feeling, and there is no electrostatic slapper, but negative ion wind. At the same time, you can smell a fresh and cool smell with the wind, just like the smell you felt before the tap was turned on. This is the smell of negative ions. Products with wind and smell are qualified negative ion generators. 4, no ozone. Because high voltage discharge will produce ozone at the same time, too high ozone depth is harmful to human body. There should be no smell of ozone (similar to the smell of straw and fish) at a distance of 0.3 meters from the negative ion generator, or there should be no dizziness after smelling for a few minutes. 5. There are no positive ions. It is very good to measure positive ions at the outlet of negative ion products with the internationally used negative ion detector, and the amount of positive ions is almost or less than that in the air. The negative ion detector can measure both positive ions and negative ions at the same time, but now many manufacturers cancel the function of measuring positive ions when using negative ion instruments, which is a sign of dishonesty. 6. Put a new plastic film food bag on your hand. When your hand is close to the outlet of the generator with good performance, negative ions will be sprayed on the food bag to generate electrostatic attraction, and the plastic bag will be tightly attached to your hand. Even if the negative ion generator is turned off, the accumulated charge will not disappear immediately, and the hand-sucking phenomenon will remain for some time. There is no such phenomenon in products with poor performance. 7. Use the internationally accepted negative ion detector to detect the concentration of negative ions at a distance of one meter and two meters from the air outlet. About 50 1 10,000 negative ions per cubic centimeter can be detected at one meter, and more than 200,000 negative ions can be detected at two meters. This shows that the amount of negative ions produced is sufficient, and this negative ion has good kinetic energy and can be kept in the air for a long time, so that this negative ion can play a role in medical care.