Sounds like a caveman tool, but it's actually the height of technology. I think this might be my favorite futuristic development of the 21st century so far. Take that, Apple!
Basically, when you're testing the air tightness of new construction multifamily buildings, you'll be moving fast and light (ideally), and getting your testing tools very, very dirty. It's a construction site. So why not rig up a toolkit that fits the purpose? Like a bucket, for example?