LFS water testing lower than home Hanna and API tests

[Upinthinair]

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.

 

[Joe31415]

What are you testing?

 

[Dan_P]

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?