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Originally Posted by kwirky
aquarium pharmeceuticals calcium kit. nutrafin kH kit.
salifert magnesium kit.
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Assuming test kits not old or off (any test kit could be off if the titration got a drop of something else in it) I personally only trust salifert.
Quote:
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Originally Posted by kwirky
Swing needle meter hydrometer. Heard they're just as accurate, but I haven't checked to see if I have to adjust it's readings. Deep Six, reads in increments of 0.001 but you can guestimate to .0005 or so by looking at it.
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Can be accurate, but have to calibrate via a refractometer, I have seen some off by .005. Go to LFS or friend and ensure accuracy.