Measuring speed range: 1-999m/s. size is easy to carry. Simple and easy operation. This product is mainly used for object acceleration and measurement. Individual users can be used to measure the design speed of all kinds of playthings. Handheld type speed measuring instrument, with high accuracy measurement, 160 groups datas be recording. Metal and fully closed, this speed measuring instrument not affect by the and current. High accuracy, with measurement data. Humanized design unit conversion function., Weight: 0.37368353409 pounds, Manufacturer: RUSWEST