This part of this European Standard specifies a procedure for the eddy current test with an internal test coil for measuring defects on the inner surface of seamless round copper and copper alloy tubes. The eddy current test method(s) required, together with the size range and acceptance level, are defined in the relevant product standard. The choice of the method for eddy current test: with an encircling test coil on the outer surface according EN 1971-1; or with an internal test coil on the inner surface according EN 1971-2; is at the discretion of the manufacturer if there are no other agreements between the purchaser and the supplier. Especially for finned tubes according to EN 12452 with high fins it is recommended to use eddy current test with internal sensor as described in this standard.