saltcreep1025
Aquarium Advice FINatic
For the color compare test kits, how do you hold the test tube to get the most accurate reading? It seems like holding the test tube right up against the white part of the card, and holding it just a tiny bit away causes quite a change in color. What do you do when trying to compare the colors?
Bonus Question: Are the Hanna Pocket Photometers worth getting? Accurate?
Bonus Question: Are the Hanna Pocket Photometers worth getting? Accurate?