API
£7.90 for 180 tests, 0.04 per test
My second fave nitrite kit and great value, the only downer to it is that it does not seem to detect very low levels of nitrite, but as a general test to find out if you have a nitrite issue it's great value and easy to use with just the one reagent. Definitly recommeneded by myself
Nutrafin
£7.29 for 75 tests, 0.10 per test
Used it a few times. It's ok. But no more reliable or effective than API, so when factoring cost in, go for the API (above)
Sera
£7.45 for 75 tests, 0.10 per test
I have used it, no problems with it and i like Sera
Salifert
£5.45 for 50 tests, 0.11 per test
Never tried it
JBL
£8.49 for 60 tests, 0.14 per test
My favourite Nitrite kit, tests for very low range of nitrite, easy to read colour differences on chart (easier than other kits), i think this is the best test kit out of them all (ammonia, nitrite and nitrate), if you can find JBL, then get it!
Tetra
£6.75 for 45 tests, 0.15p per test
Not used it
Interpet
£6.50 for 40 tests, 0.16p per test
Not used it