2017UNE-EN 62127-2:2007/A2:2017 Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields up to 40 MHz (Endorsed by Asociación Española de Normalización in July of 2017.)
2013UNE-EN 62127-2:2007/A1:2013 Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields up to 40 MHz (Endorsed by AENOR in May of 2013.)
2009UNE-EN 62127-2:2007 Ultrasonics - Hydrophones -- Part 2: Calibration for ultrasonic fields up to 40 MHz (Endorsed by AENOR in October of 2009.)