Israel’s Biotip has developed a sticker that can tell whether meat products in the fridge are still fresh and fit for consumption. It measures the amount of microbes (which include viruses, parasites and bacteria) in a food product. The sticker turns from blue to white when the meat is no longer safe to eat.
https://nocamels.com/2024/04/sensor-shows-whether-meat-is-fresh-regardless-of-best-before-date/