When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Not an expert here, but as I understand, it corrects for climate conditions so that you can compare two cars that were dynoed in different parts of the country and different weather conditions
Many countries have different surrounding parameters to test the Power. So the German DIN differs from the Italian CUNA and differs from US SAE.
If you measure in that country you have to look at i.e. a special temperature during measuring. If you have a different temp or a different pressure because your dyno is in the rockies, you have to correct to the "normal level". that would mean SAE corrected