Rubbish. Seatest is rubbish too. The only phosphate test worth a hobbyist getting is the Deltec.
I use red sea, tetra for pH, kH, salifert for ammonia, nitrate. Ca is also salifert. In reality the only tests I have seen were pretty damning on hobbyist kits, and salifert were no better than anything else. pH, kH are reliable tests as they are simple titrations, ammonia, nitrate are always unreliable as the chemical reactions are harder to 'control', measure. Always use a medical syringe to measure test water as the test vials are often strangley inaccurate