i have NEVER heard of this method of testing for allergies

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my cousin told my mom she took her kid to an chiroprator/allergist (i dont know how you get THAT combo but whatever) and he had this machine that you just hold in your hand and the electrodes go through your body and tell the machine what food you are allergic too.. am i the ONLY one that thinks this sounds like bs?!?! i mean maybe im ignorant and havent heard of this method of testing but i have never heard of something you hold having electrodes going through your body and it telling you your allergic to stuff.. her kid was allergic to eggs, sugar and wheat according to the machine.. which is just GREAT since her kid is pretty much allergic to every other food item there is also.. is this testing method real? am i just out of the loop on new medical technology??