Are you using 3 seperate reagents ? One for each test?unibob link said:[quote author=Pistol link=topic=7589.msg84934#msg84934 date=1394235343]
I'm now convinced that lot 30 is defective, the reagent is more like granules than powder and it doesn't dissolve completely, even after the test with vigorous shaking.
[/quote]Yes, right now I have lots 27, 30, 34. Lot 34 is powder and dissolves good but the readings are all over the place, 30 ppb difference between tests, I've had 2 or 3 other lots but can't remember what numbers, one was 25 I think. I'm ready to pitch it in the garb but I guess i'm wishfully thinking hanna will fix the reagents....... Maybe I will sell it to some unsuspecting smuck, just kidding.