OpenCTD-JT Parts

The OpenCTD is a low-cost, open-source CTD suitable for both educators and researchers. The platform is built using reasonably accessible parts and is powered by an Arduino-based microcontroller. Source codes and building instructions are freely available. The device, sufficiently accurate for scientific research, can be constructed for approximately $300, and is effective to 100 meters depth.

To build the orginal see: https://github.com/OceanographyforEveryone/OpenCTD

These are parts for