A pack of 3 pieces of the i5s current clamps, specially configured to provide low current accuracy while taking measurements on secondary current transformers. This cost-saving 3-pack is perfect for use with 3-phase tools such as the Fluke 434 or Fluke 435. --- Compact shape makes transporting and storing convenient; the clamp measures only 116 x 43 x 23 mm (4. 6 x 1.7 x .9 inches)