This document covers probes used for non-destructive ultrasonic testing in the following categories with centre frequencies in the range 0,5 MHz to 15 MHz, focusing or without focusing means: a) single- or dual-transducer contact probes generating longitudinal or transverse waves; b) single-transducer immersion probes. Where material-dependent ultrasonic values are specified in this document they are based on steels having a sound velocity of (5 920 ± 50) m/s for longitudinal waves, and (3 255 ± 30) m/s for transverse waves. Periodic tests for probes are not included in this document. Routine tests for the verification of probes using on-site methods are given in ISO 22232-3. If parameters in addition to those specified in ISO 22232-3 are to be verified during the probe s life time, as agreed upon by the contracting parties, the methods of verification for these additional parameters should be selected from those given in this document. Ultrasonic phased array probes are not included in this document, see ISO 18563-2.