The Hanna HI9142 Portable Dissolved Oxygen Meter is a reliable and accurate tool for measuring dissolved oxygen levels in biological laboratories. With its polarographic measurement method, this meter offers precise results for a variety of applications. The included probe and carrying case make it convenient to use and transport, making it an essential device for professionals in the field of healthcare, lab, and dental settings. The Hanna brand is known for its quality and durability, ensuring that this dissolved oxygen meter is a valuable addition to any lab.