+1
Some test kits are just not very good.
An individual test kit can go bad due to contamination.
Age of the test kit can lead to misreadings.
Speaking of misreadings, slight variations between the persons doing the testing also has an effect on the numbers. Like how dark red/pink is the Alk test supposed to be when you stop adding drops?
Aloha,
Mark
FYI, Hanna test kits are equally as susceptible to the above points. I see no reason to give my hard earned money to Hanna.
Edited by Mark Peterson - July 30 2016 at 9:53am