Originally Posted by Beaver
Same here, I always freak and take some water to LFS and they tell me its zero lol. I found looking at the test tube in the light of my tank helps out. I have coralife 50/50 lights. I look though the toube at the light and it look much brighter like the zero reading.
At my age and also with the built-in male color blindness I will never be able to tell using that brand kit.