Amperometric sensors are devices that measure the electric current produced by a chemical reaction. They typically consist of two electrodes immersed in a solution, where one electrode acts as a working electrode and the other as a reference electrode. When a specific substance, such as a gas or ion, interacts with the working electrode, it generates a current proportional to the concentration of that substance. These sensors are widely used in various applications, including environmental monitoring, medical diagnostics, and food safety. They can detect substances like glucose, oxygen, and chlorine with high sensitivity and specificity, making them valuable tools in both laboratory and field settings.