Yes, for initial cycling. I took it out when I started cycling a new tank and it kept going me the “L.Lo” error. Couldn’t get past it. Finally, Hanna’s recommendation was to buy a new one. The warranty is only a year on them.
Recommended phosphate tests
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Randy Holmes-Farley
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My Tank Thread
I personally think testing nitrite is a wasted effort, even during cycling. :)
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