Testing Halo for EMF protection for user

Please can you advise how to test Halo for protecting your EMF?

I have been asked this question by my Naturapath client who i recommended this device too

From the forum I saw that it protects without a standard program, but how do you know that? I Tested using a EMF meter and it made no difference to a phone or laptop. Whereas EMF shield devices significantly reduced the EMF and halfed the RF. So how can I prove this to my current client and others going forward?

Thanks lots

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