Hanna low range colorimeter reagent

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serez

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hi guys,
I bought a Hanna low range checker
The number is HI713 and it says phosphate low range on the instruction manual
I ran out of reagents and bought 100 counts of the HI93713-0 reagents
I took some tests and the results only come out with 0.05 differences like 0.25 or 0.3 (I used tank water and reference liquid from other test kits to try)
With the reagent that came with the checker I was getting readings like 0.21 or 0.18 (0.01 accuracy)
Is this reagent completely useless? Or is it just less accurate...
I have 100 counts of them and wanna know if they’re garbage or somewhat useful

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