The instrument only works intermittently. This is very tricky - when you turn it on the sensor light comes on and you might think it's working, but unfortunately it doesn't always work. If you want to buy one just to see how the EMF meter works in general, that's fine, the device is cheap and sometimes accurate. But if you are an electrically sensitive person and need to check all the fixtures, sockets and switches in your house to protect your health, then it is better to buy a more accurate device.
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