Abstract: A device for use on a well pumping unit. The device provides for real time measurement and recording of acceleration of a polished rod resulting from the oscillating linear motion induced by the rotating motion of the pumping unit crank. The device includes accelerometers with adequate sensitivity to allow response to both slow and fast changes in acceleration using earth's gravity as the reference point. Further, the device includes a load measuring apparatus for measuring the loads resulting at the polished rod from the weight of the subsurface coupled rod string and pumped fluids. The load measuring apparatus includes a cylindrical steel spool on which four two-element rosette strain gauges are cemented. Circuit intelligence identifies the load cell for proper calibration reference and records the real time load and acceleration data and transfers the data to a non-volatile data storage card for analysis on an external computer without the necessity of long transfer cables.