What doesn't exist for reefing yet but you really, really wish it did?

[Myka]

Originally Posted by ScubaSteve

They're doing theirs through spectral analysis of a reactant test... never made sense to me to do it that way. Too complicated. Too many things to go wrong. No wonder they are struggling!

I was doing some reading tonight and it seems it should be fairly straight forward to make a carbonate selective electrode (provided I can synthesize a molecular tweezer ). In fact, I think I could put pH, Calc, Alk and Nitrate all on the same electrode.

You can do it!!! If you could design something usable, accurate, and marketable you could do quite well for yourself.

Originally Posted by ScubaSteve

What kind of precision would people want for calc/alk measurements? Most test kits only give you 5% precision (i.e. 400 ppm ± 20 ppm), Elos is a bit better around 2.5%. Is that good enough? Is there a need or want to go better than that?

5% accuracy is fine -that's what we're all used to anyway. More accuracy is better of course. I don't think you could market something with less accuracy than test kits.