Main Features ?6.5 inch LCD screen which is intuitive and can show more parameters. Humanized design of operating interface makes operations simpler. ?Omron long lasting and light touch panel can be used more than 100,000 times. ?Auto calibration, auto temperature compensation, data storage, USB data export, clock, wireless printing, function setup, smart self-diagnosis and other intelligent functions. ?Built-in big memory can store 500 sets of test data which can be saved and transferred to USB flash drive and opened with Excel, very easy and convenient for edit. ?DO mode has functions of ATC, auto salinity compensation and auto pressure compensation. ?New structure polarographic DO electrode can measure temperature, salinity and dissolved oxygen simultaneously, equipped with special DO electrode calibration sleeve, only need 3~5 minutes for polarization. ?Combined diaphragm cap makes it extremely convenient to replace the sensitive membrane just by screwing the new cap to the electrode. ?With optional Bluetooth module and support wireless Bluetooth printing to make operations much easier for users. Optional cell phone APP connected via Bluetooth. ?IP54 dustproof and waterproof housing.