Hanna ULR Phoshate Checker - 3 different readings?

Mppp

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I just ran 3 tests in a row on my Hanna ULR Phosphate and had 3 different results. (Between .09 2nd test and 3rd I decided to put in a new battery just for heck of it btw)
.18ppm
.09ppm
.21ppm

Has anyone else ran a couple to few tests in a row w/ different ranges outside the margin of error like this on 2nd test?
 

bradreef

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If you get any particulates in that have phosphate i can get high readings.
 
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Mppp

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How do you know when you have any particulates in your test tube? Are you talking about visually/seeing a piece of food in test vial or similar? I just found a thread where member speaks of battery quality. I'm not sold on battery being the issue, but I've been wrong before?
 

Reef.

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I would have to say it’s either a faulty checker/reagent or you are not doing the test correctly.

I use the same checker and never have such wide readings.

The margin of error on that checker is only 0.02 I believe.
 
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Mppp

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I would have to say it’s either a faulty checker/reagent or you are not doing the test correctly.

I use the same checker and never have such wide readings.

The margin of error on that checker is only 0.02 I believe.
UPDATE: My wife had mentioned my son had accidentally knocked the checker off the counter while it was counting down when I left the room...this has to be the reason why readings have all of the sudden gone wacky!

I have never had problems before nor can remember the last time I've had readings above .08 (it's been awhile).
 

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