Vernier helps you keep experiments simple. Using our multi-channel Go Direct® Optical Dissolved Oxygen Probe, students can simultaneously measure dissolved oxygen concentration (mg/L), percent saturation (%), and water temperature. Students normally need to use both a dissolved oxygen probe and a temperature probe to learn how the dissolved oxygen content of water depends on the water temperature. This is an important ecological concept, as some organisms, such as salmon, require high concentrations of dissolved oxygen in their water. Your students no longer need an additional probe to measure temperature when they use a Go Direct Optical Dissolved Oxygen Probe.