Fluke i400 ac current clamp fluke fluke i400 fluke current clamps are the ideal tools to extend the functionality of fluke tools the i400 is a single range 400a ac current clamp with current output via safety shrouded banana plugs the clamp is compatible with most fluke multimeters or any other current measurement device that accepts 4mm shrouded banana plugs and has an ac milliamp range the division ratio is 1000 1 fluke i400 ac current clamp 400 a