What I meant was my results were the same when testing against the Salifert test.
But I get your point if the Salifert results were 8.6 the Elos test kit was 8 how could I say they were bang on.
But really. If you were to test your water with the Elos kit and get 8 would you take and differnt action than if you got 8.6 from a Salifert. I've never heard of anyone trying to achive a perfect 8.5 dKH
J