testing CYA with turbidity tester

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TomHunt said:
So, why isn't Cyanuric Acid tested with a turbidity tester? Seems to me every pool store and many well heeled private Joes would have a gadget that would take the guesswork out of the dreaded CYA tube's black dot.

Hach 2100Q Portable Turbidity Meter
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Too expensive for the average pool owner. A good one with all the proper calibration standards and reagent packs would run about $500. I don't spend that much on my pool in several swim seasons. Hard to justify that cost when the eyeball test gets you close enough to the right answer.

Even if a pool store had a tester like that, it still needs regular calibration and standardization testing to ensure accuracy. Doubt any pool store employee or owner really cares all that much about it.
 
Pretty cheap so I’d be worried about longevity. Plus you would need both CYA standards (at least 3 known concentrations) and NTU standards to created a decent calibration curve. If it has a tungsten lamp in it as a light source, those age gradually and so you have to repeat the calibration often. The more expensive units use infrared LEDs for more stable/repeatable light sources.
 
The ad says they can’t ship the standards because of airline rules. Are the standards available elsewhere?
 
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