Seen this one discussed a lot of times here are a few simple statements about the whole pit lane speed limit.
First and foremost as a rider/helper who has been both sides of the process with most of the different systems we’ve had in the pit lane over the last few years the current system is by far the best. Ok this is just my opinion but most people directly involved with the pits seem to agree with this.
Accuracy of the system is not really an issue, neither is calibration, for the following reasons.
It is controlled by the transponders.
These use fixed loops in the pit lane, so they never change.
The individual transponder on each bike is the same so it will trigger the signal at the same point relatively to each loop.
So the speed recorded for every bike will be calculated in the same way using directly comparable measures. Even if the speed recorded is not 100% accurate, it is so close to being 100% repeatable to not have to worry about a tolerance. Every rider gets a chance to compare their own limiter/speed/rev counter against the controlled pit lane results during practice. This negates the need to have a tolerance on the pit lane speed limit. You can adjust your own kit to suit the control information. This is effectively you calibration.
Ultimately the responsibility to get the limiter set right is the teams and it’s the riders to make sure he gets down to the speed and switches it on.