LFS water testing lower than home Hanna and API tests

Upinthinair

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LFS water testing lower than home Hanna tests. My home Hanna HR read 63 today, however the LFS says they read 30. Three weeks ago I measured 73, same store said it was 30. I doublechecked with my API and it also showed high. Which should I trust? I am thinking about taking sample to a different LFS.
 

Dan_P

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LFS water testing lower than home Hanna tests. My home Hanna HR read 63 today, however the LFS says they read 30. Three weeks ago I measured 73, same store said it was 30. I doublechecked with my API and it also showed high. Which should I trust? I am thinking about taking sample to a different LFS.
What test is the LFS using?
 
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