I have a Colorimeter by Lamotte and I've tested many of the test kits against the Colorimeter. Salifert was almost dead on. Fast Test was close on all but the
Phosphate. Although it did register that water contained
phosphate, when it did, the amount it registered with a bit higher than the Colorimeter. The API kits were also close...not dead on, but in the general vacinity. I'm going to be trying out the Elos soon. I'll post results for that when I get them.
