I have both the Calcium and Phosphate tests by Salifert.
is the easiest to read, and you don't have to be a rocket scientist for this one. The solution goes from a bright pink -> purple -> blue and it's done!
The Phosphate is a little trickier. If you have no trace of phosphates whatsoever, it's a dull milky white. But, if you have a little bit of phosphates, there are like 6 different shades of light blue to figure out. You just get as close as possible with the latter.
, if you are looking to purchase your Salifert tests online, here is a linky that compares the major online sellers with their prices on Salifert Test Kits. You'll be amazed at the price differences. You may also find out that you can now actually afford Salifert.
The list is updated twice a month. Get it here ---> http://www.geocities.com/hans1976/Salifert.html
29gal BB | 42+ lbs LR
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