1. With average value measurement and MAX retention function
2. It can be grounded or installed with an electrostatic shielding plate to prevent electrostatic interference
3. It can measure positive ions and negative ions in the air, and the gear can switch automatically.
4. There is a tripod mounting hole at the bottom of the instrument, which is more convenient for outdoor measurement
5. The service life is more than five years, and the negative ion concentration in the range of 200 million /cm³ can be measured