The Zurich Instruments MFLI is a digital lock-in amplifier that sets the new standard for measurements in the medium and low frequency range. The MFLI is available in two versions covering the frequency range DC to 500 kHz and DC to 5 MHz (an upgrade from 500 kHz to 5 MHz is possible later). With the carefully developed analog and digital front ends in combination with the merits of fast digital processing provided by the on board FPGA, the MFLI combines superior performance with the outstanding LabOne® toolset. The embedded data and web servers allow straightforward connection to any device running a web browser. The MFLi is ideal for many applications as optical chopper applications and pulsed laser applications (e.g. high power lasers).