Our final tray design allows the user to keep track of tubes. This tray still resembles trays that are currently found in labs, except ours has a piece of rubber in the middle. This then creates two heights that the tubes can be. A lower height means the tube has been used and the higher height means the tube is unused. This seems to be a feasible solution with a low manufacturing cost that would also be a non disruptive transition for lab researchers. In the future we plan to remove the excess space between tubes, and make it more aesthetically pleasing.