80
More than likely 100. API tests suck. We all use them because they are cheap. But I have a SERA NO4 test I sometimes compare it with and it's always 10ppm+- higher than the API for example....
More than likely 100. API tests suck. We all use them because they are cheap. But I have a SERA NO4 test I sometimes compare it with and it's always 10ppm+- higher than the API for example....
