Calcium Monitor!

[NaCl_H2O]

Just saw this (http://www.premiumaquatics.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=PA&Product_Cod e=PIN-CALM&Product_Count=&Category_Code=) on Premium Aquatics, anyone else seen one in person or have one?

Kinda pricey, but tempting ...

[GaryP]

I've used similar equipment in the past in a lab. They are called selective ion electrodes. There is an electrode available for almost any element. As with anything along these lines maintenance is an issue. I'm not sure how comfortable I would be with using one on a continuous basis. I'd like to see some data comparing their accuracy as compared to ICP data. Its to soon to see what kind of durability a hobbyist model would have.

gary

[alexwolf]

There are a ton of threads on RC about this. Plenty of people are using them to test their accuracy. I personally am going to wait and see, its not too hard to test for calcium, and I dont ususally do it that often.