These sensor elements are replacement parts for Raymarine ST50 and ST60 Wind instrument masthead transducer. This is shown below. These replace both the speed sensor element and the direction (compass) sensor element. These two elements comprise all the electronic components in the masthead transducer.
Complete documentation can be found here:
Wind_Sensors.pdf
This document contains full instructions for disassembling the masthead arm and installing the new speed sensing element.
There are test procedures for the sensors.
These parts are only for this mashhead instrument as shown below, no others!
Each part is available individually or as a set.