Posted by charles on
URL: https://www.es-forum.com/Air-purifiers-tp4029977p4030017.html

Patricia,

that is very normal and understandable.
There are meters and meters.
All meters can measure between a minimum and a maximum, which is determined by the manufacturor.

Most high frequency meters work in the range 800MHz to 2500MHz.
Others go from 800MHz to 8- or 10MHz, depending on meter and antenna.
With some tricks, some meters can detect between 28MHz to 2500MHz.

For low frequencies, it goes from 16Hz up to 2kHz, or 100kHz or 400kHz.
But these meters do not give proper sound.
And the bands between 5kHz and 10 MHz are not properly equipped.
So frequencies of f.i. 600kHz, 4MHz or 6MHz cannpot be grasped.

Only special detectors, from Endotronic for instance, or special spectrumanalysers, like the Spectran NF5035 can do that(from 1Hz up to 20MHz or 30MHz) .

But a HAM radio can detect these dirty frequencies also.
Be careful, because you'll hear an enormous loud noise at your ion generator, or TV or computer.