From their product description, verbatim:" The UA-767PVS includes a small arm cuff size which has a range of 5.1" to 7.9" ".This is definitely NOT true. My 2 year old son's arm is 6.3 inches (incidentally, the lower end of the OTHER range stayed in their product description). This "small" cuff is a few cm too big, and readings are predictably inconsistent.