Stack training requires a radar that can measure swings without ball impact. Not all radar devices have this capability. This page will always be up to date with radars that can capture non-impact swings.
At The Stack System, we analyze nearly all radar devices that track training swings and TheStack App factors out any bias, or systematic error, in speed measurements that are associated with our hardware design. What does this mean to you? If your radar measures with a bias, our smart algorithms adjust for it and accurately calculate your eSpeed and Distance Potential regardless of which device you are using.