Maybe it's just me but I found there test kits to be on the same level as Hagen. The PO4 did not give me accurate results, and the Ca was pretty bad as well. Counting drops to only get a final reading between 400-450 isn't exactly accurate. In fact you have to buy a separate additive just to get a reading accurate to 10ppm.

With Salifert you get nice syringes which allows for much smaller drops to be added and in the end you read the syringe. Theirs no way ELOS can compete (IMO).

I guess the concept behind their kits is that you really only need to know what your parameters are within those increments. I mean, really, does it make a difference whether your Ca is 400 ppm or 425 ppm? That's like a ten hour fluctuation for my tank at home...