I have found that the best EMF meters only go up to about 8GHz or so. This only covers the lower range of the 5G spectrum, which can extend up to approx 70GHz. The cheaper meters go up to a lot less than 8Ghz, and most do not even show their upper frequency limit or bandwidth.
So, with most meters, you’ll never know when they turn on the higher frequency 5G.
Fukushima radiation in the Pacific was not noticeable in any Pacific salmon that I purchased, and Japanese chlorella was okay too. Both showed background in my readings. My usual background is 0.10 to 0.15μSv/h, (in Ontario, Canada) and this background was maintained during Fukushima.
