Handheld High Accuracy Speed Measuring Instrument Initial Speed Velocity Velocimetry Tachometer

Features:
This product is mainly used for object acceleration and velocity measurement. Individual users can be used to measure the design speed of all kinds of shoot playthings.
Mini size is easy to carry. Simple and easy operation.
Handheld type speed measuring instrument, with high accuracy measurement, 160 groups datas will be recording.
Measuring speed ranges: 1-999m/s.
Metal surface and fully closed, this speed measuring instrument will not affect by thesun and air current.
High accuracy, with accurate measurement data.
Humanized design unit conversion function.
How to Use:
LCD backlight setting, you can set constant light or long out. When you set as automatic, the screen will light out after 10 seconds without operation.
With automatic shutdown function.
Charged by USB line, about 1 hour chargetime then you can use more than 10 hours after fully charged. The red light bright whilecharging and the blue light bright in fully charged.
Built-in overshoot protect, overdischarge protect, short-circuit protect, etc.
With holders and pinboard package. Without using the pinboard, the using pipes diameter ranges is 20-31mm, less than 20mm you can add the pinboard or tie on the pipes. Using the pinboard, the using pipes diameter ranges is 16-43mm, less than 16mm you can add the pinboard or tie on the pipes.
Included three buttons, first is switch button also is confirmation button, second is up button, third is down button.
With Chinese and English switching function. You can change the language by yourself, press the down switch after starting up, and find the language line and press the confirmation key.
Using semipermeable half-reflecting LCD screen that you can see clearly in the darkness or in strong light.