Thanks. I will probably go back to Salifert - perhaps before this kit is exhausted.
FWIW - i ran the test today on the little nano in the office where the lights are brighter. The test requires that you add a solution until the blue color disappears. The very last bit of blue may difficult to discern (even with the separate vial of water used as a control) - especially if the light is not high. That could be accounting for the difference.
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