(press along the the gray area on the left side)

                             0Nothing at all
                             
                             
                             
                             
                             0.3
                             
                             
                             
                             
                             0.5Extremely weakJust noticeable
                             
                             
                             
                             
                             0.7
                             
                             
                             
                             
                             1Very weak
                             
                             
                             
                             
                             1.5
                             
                             
                             
                             
                             2WeakLight
                             
                             
                             
                             
                             2.5
                             
                             
                             
                             
                             3Moderate
                             
                             
                             
                             
                             4
                             
                             
                             
                             
                             5StrongHeavy
                             
                             
                             
                             
                             6
                             
                             
                             
                             
                             7Very strong
                             
                             
                             
                             
                             8
                             
                             
                             
                             
                             9
                             
                             
                             
                             
                             10Extremely strong"Maximal"
                             
                             
                             
                             
                             11
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             Absolute maximumHighest possible