Product does exactly what it advertises. Some tests are easy to conduct, while others require that you don't lose the instruction guide (i.e. add 10 drops of chemical A, shake and wait 5 min then add 10 drops of chemical B, shake and wait another 5min). Tubes are sturdy and won't break easily when dropped; I have dropped two already and the cap stayed on, no water spilt and no damage to container. The color guide is a little difficult for me to read, since I partially color blind; but with a little aid from my wife there is no issue. I love the fact it comes with a regular ph test and a high ph test. Since goldfish like it a little above 7.5 then it is alot more useful when getting the ph perfect for them. I keep Red Ear Sliders as well and all 9 are health and have not had any issues with water quality since I got this kit.