YSI EcoSense ODO200M [601023] Dissolved Oxygen & Temperature Meter (Instrument Only). The YSI EcoSense ODO200M dissolved oxygen meter is designed for quick, accurate results in an economical platform. The ability to measure DO optically along with temperature, in a simple, compact handheld allows the instrument to be used across multiple application sampling strategies in the field. With a one-year instrument, probe and sensor cap warranty, IP67 waterproof case and ease-of-use, the EcoSense ODO200M will fit your needs. Additionally, this unit features a micro-USB port for transferring data to a PC (no software required) and a memory that can hold up to 250 data sets.