Indian scientist's tiny, inexpensive sensor to tell if food is spoiled

Updated: Mar 20 2023 12:17PM

New Delhi, Mar 20 (PTI) An Indian researcher in the US has developed a small and low-cost acidity sensor that can tell in real time when food has spoiled.

The flexible pH sensor is just two millimetres in length and 10 millimetres wide, making it possible to incorporate the device into current food packaging methods, such as plastic wrapping.

Industries typically use much bulkier metres -- roughly one inch long by five inches tall -- to measure pH levels or how acidic or basic the food is, so they are not suitable to be included in every package of food to monitor its freshness in real time.