Features 【PURPOSE】: Specially designed for testing high-concentration negative ions or positive air ions. It can be used to judge whether the polarity of negative ions produced by an air negative ion generator or air purifier is correct, estimate the ion concentration, and judge whether the air ionizer or air purifier is working well. 【USE】: Make sure that the switch is in the "off" position before each measurement, keep the instrument away from the object when starting, make its initial reading zero or close to zero, and then slowly turn off the ion source, the AIT(P) negative ion meter display reading will always remain until the power is turned off. 【PARAMETERS】: The test range is between 1x10000 to 1999x10000 ions/cc, the resolution: 1x10000 ions/cc, the size is 8 x 3 x 1.3 cm/3.15 x 1.18 x 0.51 inches, it is small and compact, easy to carry and can be hung as a necklace. 【LCD DISPLAY】: The display unit is millions, and the maximum reading is 1999. It can display the concentration of positive and negative ions. The maximum value of the measured air ions is retained on the display screen. The reading of the air ion tester is more stable, which is convenient for reading the measurement data. 【APPLICATION】: Such a flexible and practical air ion detector can be widely used in the measurement of various negative ion generators, air purifiers, air conditioners, and high-concentration ion sources. Power: Requires built-in 2 x 1.5V LR44 coin cells (batteries not included). Usage: 1. Switch to the "ON" position. 2. keeping the thumb and the square in front of the sheet metal, the metal plate toward the back of the air tested negative ion generator, and tested the closer air anion generator tester readings higher, whereas smaller. Therefore, to ensure the accuracy of the measurement results, leave the meter and test negative ion generator to maintain an appropriate distance. 3. the measurement process, do not touch the metal piece to the back of the instrument, otherwise it would be inaccurate readings. 4. If the reading is not preceded by the measurement symbol is measured positive ions, if the display "-" is negative ion surface. 5. To re-measure should first turn off the power, then restart it. 6. The measurement method textiles: the thumb in contact with the front metal plate, the metal plate toward the back of the textile gently rubbing test, the display will show the ion concentration and to polarity, which can produce ions as the ability of a fabric kinds of important reference. Note: 1. This instrument is a-high impedance measuring meter, it must pay attention to moisture when using and collecting, if moisture appeared then testing is unstable, reading disorder and other problems, then the available hair dryer or drying in the sun. 2. When the battery runs low battery symbol appears, it should open the back cover to replace the battery with the specifications and attention battery polarity. 3. If you need to get a more accurate ion content or measured ion content in the environment less than 10,000 (ions / cc) of the following, choose other anion detector please. Package Included: 1x Air Ion Tester 1 x Blue wrist strap Package List