The YSI Pro series of water quality meters offer precision accuracy and extreme durability for aquaculture and environmental use. The Pro ODO uses an Optical Dissolved Oxygen sensor, which is the newest, most accurate sensor on the market. Optical sensors do not have any flow dependence, so eliminate the swirling or dipping commonly used to take DO readings. The meter comes in a complete kit with the meter, probe, 4 meter cable, and carrying case. These meters can store 5,000 data points, eliminating time consuming manual tracking. The optical probes are also resistant to fouling, and require far less maintenance than a standard galvanic or polarographic probe. Meters carry a 3 year warranty, 2 year on cables and probes . Additional cable lengths are available, please inquire directly with your Global Aquaculture Supply rep for more info.