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#15
07-12-2009, 05:18 PM
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Reason why I gave up with the swing arm is one I'd been using for awhile (always rinsing between uses) one day was off 0.006. Didn't drop it, arm swung freely, no signs of damage, etc and it was toast. Can handle a consistent error but not jumps.
Sure a refractometer can go out of cal as well, but just seems they're more sturdier.
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my tank 
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