測速的數據比實際速度慢大概十公里，請問如何調校
The Bushnell Velocity Speed Gun (Model 69) does not have a manual calibration or adjustment setting. According to the manufacturer, the device is factory-calibrated…
Manuals+ Q&A
Bushnell 69 — questions & answers
Read setup, compatibility and troubleshooting questions about Bushnell 69.