The hardness of wood flooring is measured by something call the Janka test. A .444 inch steel ball is driven into the wood in question to half of the ball's diameter.
Kids and Dogs Make the Janka Test Essential
Before buying and
installing your wood floor, it really is necessary to look at the Janka test. Wood floor
does get scratched and dented through normal use. On top of that, if you have kids or pets, you will have increased concerns about dents and scratches.