ok now you have to mix a batch of salt and test!

I'm not exactly sure what my salt is supposed to be, so that won't help :)

I've found Reef Foundation Pro Test Kit to be quite accurate (tested against calibration fluid) and easy to use. Straight forward directions, no math, no drops and very granular if you want it to be.

Never heard of this brand. Where is it from?

You must have an uber rare ltd edition misprint ! My instructions (kit is only a couple months old) are correct as was my last one.

It's made by Red Sea. Here is a link for a little review on them (hopefully I don't break rules posting this link here?).

http://marine-engineers.org/2012/03/...-kit-reviewed/

Thanks. Link is fine :)

Maybe we should be checking to see if the instructions have an expiry date not just the reagents? Geeeze.

I can't say I noticed the bad math example before on the instructions but it's been a long time since I looked at Elos Ca test kit instructions in detail. The last kit I had was also consistently giving me bad readings of .. interestingly enough I think it was always 450 as well. I can't remember for sure I'd have to check my notes but I stopped using the Elos Ca test kit. I like the Salifert best. I did pony up for a Ca checker from Hanna but it has its own issues (basically you test 0.1ml of tank water which you have to add 0.9ml of lab grade distilled water (doesn't everybody have this? I carry some in my wallet just in case because you just never know when you're going to need some lab grade distilled water) and when you're doing a test on such a tiny sample it just has to be prone to fluctuating readings, I would think .. esp if you cheap out and just use "regular old vanilla RO/DI" instead of "lab grade distilled water.")

1+1=2 Anything else I can help you with?

I'll check the frag tank, if I get 450 on that, the kit goes in the trash. Or I'll give it to Jake :)