This is strange, my Hanna Alk checker was also saying 9.0 and my Salifert says 10.0. Someone in the #AskBRSTV group on Facebook also reported their Hanna Alk checker reporting 1 dKH lower than their Salifert. I wonder what the heck is going on with either the Hanna or Salifert recently.Found another issue Hanna checker was off showing 8.9 for alk. Just did a salifert test it’s at 10