Question about Monitors/Probes

[globaldesigns]

I am looking into maybe buying some monitors for PH, Calcium, Magnesium and so forth.

I can see that they exist for ORP, PH, Temp... But do they make monitors for Calcium, Magnesium? Just wondering, it would be nice to do away with the test kits.

And if they do, what manufacturers do you recommend?

[kien]

I have never seen Calc and mag monitors but would be VERY interested and delighted to find out if they do! :-)

K.

[xtreme]

They do make calcium monitors (http://www.jlaquatics.com/product/pp-mcal/American+Marine+Pinpoint+Calcium+Monitor.html), not sure how well they work. I don't think magnesium monitors exist.

[fencer]

They do make ion selective probes but they are very expensive