The Printalyzer Densitometer is a project whose goal is the creation of an affordable reflection and transmission densitometer for photographic darkroom use.
It was initially conceived as an accessory to complement the Printalyzer Enlarging Timer & Exposure Meter to ease the process of creating paper profiles. However, given the general utility of such a device, it has been spun off as a separate project in its own right.
A good overview of the project can be found in these blog posts:
This project, using hardware tagged as "Revision C" and labeled as DPD-100, is currently shipping as an official Dektronics product. Links to the user manual and regulatory compliance documents can be found on the product website.
The "hardware" directory contains KiCad projects with the complete circuit schematics, bill-of-materials, and PCB layouts.
The "software" directory contains all the source code for the firmware that runs on the hardware.
The "enclosure" directory contains any CAD models and related resources necessary to physically assemble the device.
Individual directories will contain LICENSE files as needed, with relevant details. Generally, the hardware will be CC BY-SA and the software will be BSD 3-Clause. However, external resources may have their own individual license terms.