The WOS InterrogatR downhole memory sub allows placement of high frequency sensors directly in the drill string during the intense bottomhole environment of frac plug drillout operations. The self-contained sub records pressure, temperature, RPM, and 3-axis shock to its on-board memory for post-job data retrieval and analysis. The memory sub utilizes robust electronics, fittings, and housing designed specifically for WOS tools and drillout operations. Advanced features like extended battery life, pressure activation trigger, and redundant dataset recording permit high confidence in operational success with no intervention from wellsite personnel needed.