Features:Extremely versatile - the meter automatically recognizes which sensors you plugin so you can easily switch parameters whenever you wantSelect a meter with the number of channels you need (1, 2, or 3) and the sensors for the parameters you are measuring (pH, conductivity, or DO) Eliminate downtime with smart sensors that feature built-in calibration and measurement informationRugged, waterproof and dustproof housing with an IP67 rating for use in any environmentNonslip ergonomic design is comfortable to use and shock-proof and scratch-resistantEasily view measurements with large color graphic TFT-LCD, even in dim lighting or bright outdoor sunlightDownload and analyze up to 10,0000 data points easily with a micro USBAccurately measure pH, ORP, conductivity, TDS, resistivity, salinity, dissolved oxygen, and temperature with automatic sensor recognition functionGet easy-to-read and accurate readings with auto-hold, auto-stable, and real-time measurements with stability indicators. The Environmental Express Oakton 300 series multiparameter meters utilize smart sensor technology with sensor heads that feature a built-in digital circuit for automatic sensor recognition. Sensor information including sensor ID, calibration data, and measurement setup is stored in the sensor head and viewable on the meter display when the sensor is connected. Sensor heads are easy to connect and disconnect with a waterproof push-lock connector. Sensor cartridges (pH and EC) are replaceable for a cost-efficient and environmentally friendly system. The Blue LED light on the sensor head functions as a reading stability indicator, flashing until the reading is stable. Meter stores up to 10,000 data sets with the date-and-time stamp for accurate and easy analysis. Quickly transfer data from meter to computer seamlessly via USB cable or wirelessly via Wi-Fi. Easily take measurements and conveniently store meter and electrodes with a built-in foldable stand on the back of the meter. Three grooves on the meter serve as electrode holders, to hold up to three electrodes simultaneously.