API
£8.48 for 90 tests, 0.09p per test
Good value, i have heard stories on one forum of problems with API Nitrate readings being wildly varied from same tank. However, if you dig a bit deeper, you will find that this is a problem associated with many nitrate kits and not just API. This is a decent kit, it will always (100%) confirm to me that my tpa readings are in the 20 mg/l range and tanks in the 40 mg/l range. Uses x2 reagents and no powder
Nutrafin
£7.90 for 80 tests, 0.10p per test
I dont like it, colour chart (even for nitrate kits) is useless once you get past 25 mg/l. Uses x3 reagents and no powder
Sera
£7.45 for 60 tests, 0.12p per test
I like this one, easy to read colour chart, uses x2 reagents and powder
Salifert
£6.95 for 50 tests, 0.14p per test
I dont like it, colour chart (even for nitrate kits) is useless once you get past 25 mg/l. Much the same as the Nutrafin one
Interpet
£6.50 for 40 tests, 0.16p per test
never used it
JBL
£11.15 for 50 tests, 0.22p per test
I had some problems with this one, all my results came back at under 10mg/l nitrate, which i dont think was accurate
Tetra
£11.20 for 45 tests, 0.25p per test
My favoured Nitrate kit, although too expensive at £0.25 per test. Easier to read colour chart when compared to other Nitrate kits. x2 Reagents and a powder.