Using acceleration sensor (electrostatic capacitive type), IMPAK-02 observes shocks given during transportation. Setting a threashold for shock value (G) and selecting a recording interval (Seven sampling periods are available, from 1 second to 60 minutes) beforehand, IMPAK-02 observes the given shock continuously and records the maximum shock, which exceeds the threashold with the date and time by a built-in nonvolatile memory. The recorded data for shock is the maximum G value for each axis (X, Y, Z) in the selected recording interval. IMPAK-02 has a rechargeable battery built-in and works for 30 days continuously with full charge. After transportation, connecting to PC through USB cable, the recorded data is listed up and graphed instantly. It is also possible to output to the CSV or Excel file, and to analyze data freely.