[Ron99]

Originally Posted by lastlight

I use Elos for Calcium and it's good to nearest 10ppm. But yeah Alk is in 0.5 increments.

But to get that precision with the Elos you're supposed to do it in two parts which adds time and more margin for error. Let's see how precise the checkers are. Would be nice to have a quick and easy one step test that is precise down to 10ppm or less.

Originally Posted by Veng68

What do you think of this?

http://www.sensafe.com/pond_products.php

Cheers,
Vic

I actually did contact them once but they have never tested in salt water and do not know if their kits would be accurate or not.