Dissolved oxygen is the level of gaseous oxygen dissolved in water. Oxygen dissolves in water by direct absorption from the atmosphere, by rapid movement, or as a waste product of plant photosynthesis. Water temperature and volume can affect dissolved oxygen levels. Dissolved oxygen is a key parameter of water quality indicators.

The Do Sensor is a very unique product to use. It can act as both a humidity sensor and a light sensor. The Do Sensor then sends its readings over Bluetooth to your phone. There is an app that you can download in order to see what the reading is. The app will then give you information such as the humidity level, LED color(s), or how much light it is getting. Unlike other similar products, it has a long-lasting battery life of 6 months (CR2032 battery). You can use this in a variety of different ways. You can see how moisture affects plants’ growth and see how plants react to different levels of humidity. You can also test out your various electronics such as computers and phones to see if they are getting enough light or not, plus other more practical applications you could use it for at home or in school.