The Salifert Ammonia Test is really hard to read for me between 0, <0.15, and 0.25. the readings look different in all types of lighting. Near the window it has a brownish hue to it, not deep brown, but you know... In a white lit room it can be white, yellow or brown depending which way I am facing. So I was wondering what type of lighting is recommended to accurately read the Salifert Ammonia Test?, because it doesn't seem to tell me in the directions.

