I was with a bad rash in my waistline for the last 2 years and a half. I would cut myself bleeding and the doctors would only give me steroids cream that would not work. All while i was telling them to check me for a nickel allergy but they think they know more than anyone and didn't check me for that. I tested my belts with this kit and they all had nickel. Threw them away and wore the nickel free belts. Problem solved! Hallelujah! After more than 2 years that itch is gone. Thank you guys