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by Carol
on 5/10/2011
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I have had other ph probes and can tell you, there is a difference, this probe is quality. Neptune puts out great products.
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by Cablebox615
on 1/6/2010
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You will need two different Calibration fluids. Like for reef tanks, I would suggest using the 7.0 and the 10.0. It works great with my Aquacontroller Apex.
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