dangers in radionic diagnosis?

For the past few months I have been seeing an alternative health practitioner who uses a radionics device for diagnosis. As far as emotional stuff went he diagnosed my gf 99% accurately over the phone....my mother saw him and got him to test for H. pylori and he said negative...she went to her doctor's and her urea breath test came back positive (not to mention all the symptoms add up)... So now I'm wondering if this guy is a complete quack or if his frequencies might be off or what? Has anyone used any "entry" level radionics machines with success and actually performed scientifically objectified experiments to verify what their boxes are telling them?