Handheld Test Magnet: Heavy-duty horseshoe is ideal for checking the gross magnetism of items before they are introduced into the MRI suite. The sturdyhandle was designed for ease of use. A metal keeper prevents this powerful Magnet from being attractded to metal items until you choose to use it. For use outside the scan room and away from your MRI's magnetic field. Magnet: 1-3/4" x 1-1/8"H 9/16" thick. Keeper: 1-3/4"L x 1/8"H x 9/16" thick. Handle: 8". Overall length 9-1/8". 22-lb pull, 1,000 gauss. MR-Unsafe