Most home improvement stores sell inexpensive Chinese microwave leak detectors and some sell a mid grade which I actually have one in the pantry our microwave lives in. Eight to nine of ten microwaves show leakage around doors when running. If I get my good microwave leak detector or a trifield meter every microwave ever tested shows some leaking around doors if running at high power. If they hemmorage microwaves out the seams around doors would assume they leak the other direction.
And real tests have shown they don’t. Unfortunately the tests are classified for now. Besides which, shunting electricity to ground does nothing for the geomagnetic wave.These have been tested. You may want to give these a try. ( not part of the company).
https://www.5minreview.com/truth-about-emp-protection#:~:text=To summarize our due diligence, EMP Shield is,Shield will actually work and isn't a scam.