This document discusses biosensors and diagnostic products. It defines a biosensor as a device that combines a biological component with a physicochemical detector to detect analytes. It describes different types of biosensors including calorimetric, potentiometric, electrochemical and optical biosensors. It also discusses applications of biosensors in glucose monitoring, environmental monitoring, and pathogen detection. The document then defines diagnostic products and provides an overview of the diagnostic market in India including types, size, growth rate and examples.