The MM4420 provides a DC output voltage or current  proportional to the quotient (ratio) of two DC inputs. Typical input ranges are  4/20 mA, 10/50 mA, 0- 1 V, 0-5 V, and 0-10 VDC. Other ranges are available down  to minimum spans of 1 V or 1 mA DC. Standard calibration provides the output at  full scale (100%) when both inputs are at full scale (100%). Other calibrations  are available.
                  All Wilkerson products are designed with RFI filters and  lightning protection to reduce susceptibility to electrical noise and damage by  lightning.
                  TYPICAL APPLICATIONS
                    Controlling relative speed, mixing rates, compensating  flow readings for temperature changes (mass flow = flow rate/temperature), etc.