Ion Stick(TM)
Budget Air Ion TesterThis has got to be the simplest and lowest cost way to measure Air Ions. Very easy to use and so small it's barely bigger than a finger. Especially good for testing ion generators and air purifiers which claim to produce ions.Maximum reading of 1,999 countsReads net + or - ionsRange: 1 x 10^4 to 1,999 x 10^7 (ions/cm)Easy to hang as a necklace/keychain or keep in handPowered by LR44 button size batteryDimensions (L x W x H): 78 x 27 x 9mm