Review on 🌬️ KT-401 Mini Air Ion Tester: Accurate LCD Display of High +/- Air Ion Concentrations by Bryan Reynolds

I don't have this unit but am considering buying one. But please note that sufficient air circulation is necessary. Use a powerful fan in the room where this device is used. Wait a while for the reading to stabilize and, if possible, leave the room at that time. Come back in about 45 minutes and check your reading.