Apple will bring a blood oxygen measurement feature to some of its watch models via a software update after receiving approval from the US government amid a protracted legal dispute over the technology, it said on Thursday.The move will allow users of Apple Watch Series 9, Series 10, and Apple Watch Ultra 2 in the United States to view their blood oxygen levels on a paired iPhone.It comes after years of legal wrangling with Irvine, Calif.-based Masimo, which has accused Apple of hiring its employees and ste ...