So then what is the best thing for me to do in this situation? I'm confident in the way I'm performing the test, and have other Hanna checkers that don't pose this confusion for me -- for example my Alk checker is always consistent w/my Salifert Alk test. I honestly wondered if something was wrong with the actual checker.I'd rather confirm the test was working correctly. It's like checking to see if a car motor is working, but not checking if the driver knows how to drive. lol
The test with the color standards in no way validate the overall method or the reagents or procedures used.