Zulkit Junction Box ABS Plastic Dustproof Waterproof IP65 Universal Electrical Boxes Project Enclosure with Fixed Ear Black 3.94 x 2.68 x 1.97 Inch (100 x 68 x 50 mm) (Pack of 2)

Excellent Project Boxes and they will hold an Arduino Uno with room to spare.

Good nice, not too big, only this is, you need to drill your own access holes

This worked for my project. The box is sturdy and the mounting tabs work well. The gasket fit well and seems to be sufficiently water tight (I'd call it splash proof, not submersible). Only complaint, there are only two mounting bosses for a circuit board and they are not really well positioned. No screws are included for the mounting bosses. That's really the only thing that keeps me from giving this 5 stars.

Works As described.

I had four 12 VAC 50 watt halogen lamps with fried transformers. I found these floor lamps to be quite elegant and versatile for reading etc. The lamp design used the metallic lamp body as the conductor (allowed at 12 V). Anyway, I used these junction boxes to house 15 watt 12V DC transformers and replaced the 50 watt Type G4 base halogen bulbs with 5 watt G4 LED bulbs. They all work very well and are at least as bright as the old halogen bulbs which also had the disadvantage of becoming hot enough to burn if the lamp head is touched - the LEDs barely get above blood temperature. This indoor application does not require moisture resistance which may account for the price of these junction boxes. However, they serve the purpose very well, housing the transformers and providing strain relief.