Hanna Calcium Checker with Reagent Refill

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mrsaltwatertank

mrsaltwatertank

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Good condition Hanna Calcium checker. Includes reagent refill. $30

IMG_1505.JPG
 
WWC
I've had zero luck getting mine to function properly. It always reads 550ppm, even when the RedSea kit said 480. Is yours working?
 
Is this PU only?
 
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