... 2.Gain ratio technique 3.High SNR 4.Intelligent Eddy Current Tester 5. Auto-measurement Model SMART-35++ Intelligent Dual band ... :SMART-35++ intelligent dual band ,four channel eddy current tester is distinctive which adopts DSP technique real-time multi-frequency ... detection on service and preservice of various popeline in the electric power , petrifaction industry,I.e,Cu ,Ti,stanless steel ...