I currently have 2 different EMF meters. When I first started waking up to the health issues related to EMFs, I just went for a cheaper, but nice looking meter (the Poniie PN8000). After playing with it for a bit and determining that I was finding a correlation between the magnetic field and how my wife (who is fighting cancer) was feeling. Being a data-driven kind of person, I found myself wishing I could just record all the data over time and plot it on a graph to help make better sense of it all. So I started doing my research and found the following videos which helped me make the decision to go with the GQ EMF-390 meter. In the few months I've had it, I've been impressed.
This is a really good informational video.
Some of the graphs I made using the data exported from the EMF-390... I did have to write some PHP code to massage the exported CSV file, but once I did that I was able to just upload the data to Plotly
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