USB Component Tester in a keychain is a universal testing device for electronic components with three or lesser pins. It can automatically detect the plugged-in electronic component and measure the desired component parameters without having the user to manually select the component type, unlike the multimeter. It is based on the popular AVR TransistorTester. 

With a custom application built using electron, USB Component Tester provides the user with all desired component insights with a clean and minimal user interface. It works with all OS platforms like macOS, Windows, and Linux based systems. For MacBook Pro users, the application also supports TouchBar Interface. 

Usually, many hobbyists, makers, or even engineers have a computer open beside them while working. This USB Component Tester adds a utility to the systems. It replaces other devices such as an ESR Meter, Function Generator, Capacitance Meter, etc. making the workspace free and allowing the user to work more freely.