Not familiar, what is a 10% check?
It is an OWT that suggests the "best" tire pressure is such that the pressure rise from "cold" to "hot" is 10%. So, if you inflate your tire to 30 psi "cold", ride for some period of time and check your "hot" pressure and it is 33 psi, you have the "optimum" pressure. If the rise is less than 10%, you reduce pressure to allow more sidewall flex and thus greater heat generation. If the rise is more than 10%, you increase pressure to reduce heat generation.
This "rule" has several flaws and I consider it next to useless. A few issues I have:
1. Pressure rise is not linear and will vary based on where you live. What works in Arizona may not work in Alaska even with the same 10% rise.
2. Some tire types inherently generate less heat (radials vs. bias, belted vs. not, etc.).
3. Is the 10% test done at max gross vehicle weight? I seldom see vehicle weight considered.
4. What defines "cold?" First thing in the morning or after sitting in the sun for a few hours?
5. What defines "hot?" 30 minutes at 55 on a blacktop road? 60 minutes at 70 on a concrete interstate? Something else?
6. This probably only matters to me, but I have yet to read a technical paper that provides any engineering basis for this "rule."
That's my opinion and worth every penny you paid for it.