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The PID 110 is a proportional-integral-differential regulator for frequency stabilization of tunable diode lasers (DL pro, DFB pro). It accomplishes side-of-fringe locking to the slope of an atomic line or a cavity transmission peak. The module works both for HV (piezo actuators) and LV (laser current) control tasks. Users can adjust all relevant parameters, including P, I and D contributions, set point and regulator output range.