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- May 22, 2016
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Hanna is good, but it gives the same low level performance as API, most everybody with an established stable tank will read 0.1-0.2ppm total ammonia on hanna, the same way they read a slight blush of green on API ammonia.
It's just an artifact of the test kit chemistry.
The short answer is to simply interpret 0.1-0.2ppm readings as zero baseline the same way a slight blush of green on API should be read as zero.
@Propane the advantage of hanna over API ammonia is that it will give you numbers.