Why won my clamp-on tester measure current with the test lead set?
The primary purpose in the design of a clamp-on tester is one that enables the user to safely take current readings on devices that operate on 10 amps or more. Below 10 amps, most of our multimeters have the capability to measure below 10 amps safely. We also have in our clamp-on line the ACM6000 mini-clamp, which will measure down to 10 milliamps with great accuracy.