Micromatic made these sticker strips years ago that I put on a two of my kegs that help me see how full they are. They work really well but it looks like they stopped making them a few years back. Anyone know if there's a similar product or what material the strip is made out of? I'd be perfectly happy to just buy a roll of whatever it is and cut it to strips. They're just way more convenient than pulling my kegs out of the kegerator, shaking it up, and not being able to drink from it for a few hours.
Here's a reference thread with pictures from many years ago: Confused by Science (keg smart strip)
Here's a reference thread with pictures from many years ago: Confused by Science (keg smart strip)