In eddy current testing (ET), different measurement can be carry out through the selection of the test
frequency. In conductivity measurement, the selection of eddy current test frequencies permits to select
the specific material properties to be measured. The test frequency selected should be sufficient high that
eddy current penetration is limited only to fraction of the test material thickness. This paper describes the
effects of test frequency on the conductivity measurement. This experiment done by applying different
values of test frequency which is 20 kHz, 100 kHz and 1 MHz