The FAST16-mkIII system records electrochemical data (amperometry, chronoamperometry) from up to 4 independent channels, digital (event), and marker information and generates waveforms for experimental control. It features high-speed data capture at rates up to 1.2 MHz with 16-bit resolution. The data recordings from up to 4 microelectrodes are processed by the Windows-based, real-time software installed in a separate computer.