Each species of organism thrives in a specific temperature range, and many animals use temperature as a signal for when to reproduce and when to migrate. If there is an abnormality in temperature this can disrupt the balance of aquatic ecosystems with devastating effect. Water temperature also impacts water density; differences in water temperature and density can cause stratification.

Changes in temperature levels in water can be caused by a wide number of factors, both natural and anthropogenic. Natural causes include weather, groundwater inputs and turbidity. Anthropogenic causes include removal of streambank vegetation that previously provided shade, impoundments (body of water confined by a barrier, such as a dam), discharge of cooling water, and urban stormwater runoff. Using a water temperature monitor can help to detect sources of thermal pollution and ensure the health of aquatic species.

A water temperature sensor forms an integral part of our multi parameter water testing equipment, because temperature affects so many other processes. It's often necessary to compensate for temperature when measuring other parameters; our Aquaprobe devices do this automatically.

Temperature levels in water vary with width and depth. It stands to reason that water is warmer in water where the sun's warmth is able to penetrate. Water that is shaded will be cooler on a sunny day than water that is not shaded. Ideally, the vertical and horizontal temperature profiles of a water body should be determined at least once per sampling site. This is achieved by collecting temperature measurements at varying depths and across the surface of the water. Water temperature probe tests should always be taken at the same place each time.

Aquaread's water temperature monitor can be used at any time, but it is important to understand that water temperature fluctuates diurnally, between day and night, and seasonally.

Using a water temperature sensor over a period of time allows the user to gain an understanding of these variations in water temperature, and of what is normal for each specific sample site. Knowing what is normal allows for the identification of abnormalities. As temperature affects so many other processes, a temperature reading is taken almost every time water is sampled and investigated.