Abstract: A novel and practical on-the-go (OTG) USB-compatible anti-counterfeit reader with an emitter circuit that outputs a first signal to an object under test that will emit a second signal, and a receiver circuit that will detect the second signal and converts it to an electric signal to be further analyzed is disclosed. The emitter and receiver circuits are in electronic communication with a control and identification circuit which controls the emitter output duration and intensity and includes programming logic to authenticate the object under test based on the specific reading of the electric signal received. An interface conversion circuit is in communication with the control and identification circuit and is configured for level conversion of data between the control and identification circuit and an interface. A method of utilizing an OTG, USB-compatible anti-counterfeit reader to quickly and efficiently authenticate products is also provided.