That is an excellent answer. Thanks.
I already have my phosphate colorimeter on order (ha..ha...from the US!), and was trying to decide on a nitrate test method. Like you, I can't stand those colour matching tests - there just isn't enough accuracy on the low end.
I'll see how much fuss it is to use the colorimeter, then make my decision.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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