Here's the second arm Logitech built to test the G402 (and other mice, but mostly the G402's sensor-to-accelerometer hand-off). The screen to the left charts data from the mouse in real-time, and shows the sensor losing accuracy (and then regaining it) as the mouse moves too quickly and then slows down again. In the middle, the accelerometer takes over, with no delay in the hand-off.
"They were kind of disappointed with me when I told them [the first arm] wasn’t going fast enough," senior product manager Chris Pate said with a laugh. Where the first arm topped out at around 280 inches per second, this one tested the G402 to about 500 inches per second. The mouse is actually capable of tracking at even faster speeds, according to Logitech; this arm still wasn't enough to overcome its tracking. While the arm can move at faster speeds when it's charged with more air pressure, more pressure causes vibration which throws off the results.