Accuracy and precision
Polar and Look commissioned an independent study performed by Rad Labor, a German sports science company associated with the University of Freiburg and the German Olympic program.
All three systems were tested extensively both indoors on an ergo bike as well as outdoors by elite riders. Rad Labor then compiled all the data and used the data that agreed between the three based on assessment. The study showed that the KeO Power system is on par with both the SRM and Powertap systems, accurate within 2%.
Precision increased as power rose, a feature designed into the system with the selection of strain gauges designed to be exceptionally accurate over 150 watts.
Look tests each unit before it is sent out of the factory to ensure that it falls within that +/- 2% window.