This transducer is used for determining the Crack Mouth Opening Displacement (CMOD) conforming to EN 14651. The transducer have to be positioned over the notch sawn previously into the test beam. The specimen has to be loaded by a suitable Flexural frame as, for instance, our models 50-C1201/BFR or 50-C1601/FR, and a control console capable of applying load under displacement control as our model Advantest 9 or MCC MULTITEST.