Originally Posted by scuba_steve
try having a pet shop test it for you !! how old is the test kit !! that can be an issue as well !!
They could use RaveChild's test kit to test their water but supplying the LFS
with a water sample won't work. Once you remove the water from the tank ambient O2
(if sealed) will dramatically affect the results of the pH. You would end up with inaccurate results.
I know Hagen says their test is for both FW
but I would also suspect that may be a cause. I mean no offence to Hagen but being a FW
specialist, their test kits may not be properly geared for marine testing. Are there other manufacturers at your LFS
that are made specifically for SW