This is part of what will be a portable hand held device that can test 6vdc powered pinball bulbs (incandescent & led) #44 / #47 & #555 as well as Comet Pinball Matrix LED strips.
It is designed to test #555 in the front as well as a double socket for #44 / #47 on the top face to test bulbs or compare the bulb types, colours, brightness etc. Then to test Comet's Matrix gear simply plug in one of their spare bulb adaptors in to one of the 3 sockets on the tool. To activate simply flick the switch on the top face which will light up to show power is on. And it can be used as a torch / work light. (Both my wife and daughter stole my v1 and v2 test lights and now use them as book lights at bedtime).
It is designed using some available parts here in Australia - eg the switch, 6vdc battery pack and needs a few holes tapped. For a small fee I can purchase the parts and build a kit for you or supply the parts to you for a cost fee.
2 x 3D printed parts are required. This is the main body that houses the switch and bulb sockets which needs the holes tapped in it and the other part is the access hatch.
v2 has a wider base so it can standup better and be used as a work light etc.