So on Saturday I bought a Tetra Nitrate test kit as I was not 100% convinced that my API master test kit was reliable.
The resulting differences were shocking.
Tetra = 25ppm
API. = 60ppm
I never quite trusted my API Nitrate test.There is too Much room for error with all the shaking and what not.
The tetra Nitrate test involves less shaking and no shaking of the test bottles themselves.Only the tube with the tank water and Nitrate test solutions mixed needs to be shaken and only for 20 seconds.
Great product from tetra