The Extech DO700 Portable Dissolved Oxygen Meter is a powerful 9 in 1 tool with automated salinity compensation as well as manual barometric pressure compensation for DO measurements.  This meter comes in a waterproof housing that meets IP57 standards.  It has a host of great features and an internal memory that can store up to 400 readings along with a serial number, temperature, and measured value.  It also features a large blue LCD display with a back-light for viewing in dimly lit work environments.  The auto-power off feature will prolong the life of the battery and it also has a disable function. The DO700 accurately measures dissolved oxygen extremely easily, and is capable of displaying various different readings including concentration/saturation, PH, mV, conductivity, TDS, salinity, resistance and temperature.  In addition, the device boast automatic salinity compensation, and barometric pressure compensation. Outside of its impressive technical specifications, the Extech DO700 Portable Dissolved Oxygen Meter also includes a number of basic, but extremely useful features including auto shut down for when the device isn’t being use, a large, dual LCD display with back-light and built-in internal memory that can store up to 400 readings. Each reading is also sorted by series number, measure value and temperature, so locating your data for later use is extremely easy. The Extech DO700 Portable Dissolved Oxygen Meter comes complete with a DO probe, hard carrying case, polymer conductivity cell, pH and conductivity calibration solutions, pH/mV/Temp electrode, and batteries.