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agree...the HC makes things idiot-proof for me....Of those 3 salifert. But hands down my hanna alk checker blows them all away.
I use API because I can do a test in under 30 seconds. I compare it to my Hanna alk checker every few months just to make sure the API is still accurate. It really just depends how accurate you are looking to get. The API can get you within .5 whereas the Hanna is going to get you a very specific amount. I haven't used the other 2 kits you list so I don't know how specific they get with their readings.
Agree, Hanna checker worth every penny. Before getting the Hanna I used RedSea. I found it to be a little off vs. Hanna.
How do you know which was accurate (if either)?
I checked it against two other Hanna checkers in my area. All within a ppm or two. I guess they all could be wrong, but not likley, at least I hope.
as accurate as rs pro imeI've been using API for about 5 years with no problems

