Water Test Education Kit, Dissolved O2

works as normal

This test does dissolved oxygen(DO) and biochemical oxygen demand (BOD). It is important to note that there are different directions depending on which you are testing for. The dissolved oxygen test takes about 10 minutes (4-5 for tablets to dissolve, and another 5 for the color to develop). The biochemical oxygen demand test takes 5 days. You need to keep the vial covered with aluminum foil and in a dark place during this time. For both you compare the color to a chart to determine the parts per million, but it only shows 0, 4, and 8 parts per million for both tests. I wish it included more than 2 glass vials, but that is just for my needs. I would guess the idea is one for DO and one for BOD.

Would be helpful to know on purchase that water samples need to sit wrapped in tin foil for five days before testing. The two tubes are completely inadequate for a larger project.