Negative oxygen ion detector can be used to measure the concentration of the anion of the body, such as environment, air cleaner, hair dryer, air conditioning, anion powder, solid material ( Stones and ash) , cloth, fiber, etc. Apply to the academic unit, environmental protection system, anion generator research and development institutions and related display unit. For academic units, environmental protection system, anion generator research and development institutions and related display unit. Use of negative oxygen ion detector considerations are as follows: 1, measurement, to keep the air relatively static, not flow, surveyors shall be far from an arm around at the same time; 2, the battery voltage is lower than 7. 5 v, should replace the battery, standby cases ( 备用) Battery life is about 10 hours; Measurement conditions ( 测量) , battery life is about 2 hours, otherwise, the results of the measurement will have a great error; 3, don't continue boot determination; Four, reading to take a numerical range in the middle of the readings