Much of the water on Earth’s surface ... no less than five different sensors. These can determine the oxidation-reduction potential (a chemical indicator), the pH (acidity), total dissolved ...

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 ...

This study presents a highly sensitive optical fiber sensor for arsenic detection in water, achieving a remarkable 0.09 ppb ...