Anyone can use this meter with its plain language screen prompts, soft keys that update for easy selection and a multilanguage interface that supports English, Spanish, French, Italian, German and Chinese Dont miss a reading – AUTO-READ* locks in the stable reading on your screen, ready indicator alerts when readings are stable and timed reading gathers data in specific time intervals Up to five point pH calibration with automatic recognition for USA/NIST and DIN buffers Fix pH and ISE calibration errors without a complete recalibration with calibration editing No need to worry about DO probe compatibility – the meter accepts and automatically recognizes Orion polarographic and RDO optical/ luminescence-based probes Its easy to get accurate DO results with automatic temperature, automatic/manual barometric pressure and automatic salinity compensation when used with simultaneously with conductivity Calibrate for DO using water-saturated air, air-saturated water, a Winkler titration or zero point calibration Selectable cell constant allows for use with 2- or 4-cell conductivity cells For advanced accuracy in conductivity readings, selectable reading reference temperatures of 5°, 10°, 15°, 20° or 25°C with linear, non-linear, nLFu or EP curve options Choice of practical salinity or natural sea water curves for salinity readings Linear or ISO/EN 27888 curves for TDS Whether you use ISE infrequently or have multiple samples every day – up to five point ISE calibration with advanced features such as timed end point, linear point-to-point, non-linear selectable auto-blank and low-concentration range stability Non-volatile memory holds up to 5000 data points with time and date stamp Easily transfer data and keep meter software up-to-date with the USB and RS232 ports and complimentary data analysis software Four AA batteries (included) provide over 800 hours of operation or purchase the universal power adapter (sold separately) to use AC power Perfectly portable, waterproof and protected to take anywhere with a IP67-rated housing Three year meter replacement warranty Certifications: CE, TUV, FCC Class A limits Range -2.000 to 20.000 Resolution 0.1, 0.01, 0.001 Relative Accuracy ±0.002 Calibration Points up to 5 Range 0 to 19,999 in ppm, M, mg/L, %, ppb or unitless Resolution Up to 3 significant digits Relative Accuracy ±0.2mV or ±0.5% of reading, whichever is greater Calibration Points up to 5, Calibration point editing, timed nd point, linear point to point, non-linear selectable auto-blank, low concentration range stability Range ±2000.0 Resolution 0.1 Relative Accuracy ±0.2mV or ±0.05% of reading, whichever is greater Calibration Points 1 Range 23° to 221°F (-5 to 105°C) Resolution 0.1 Relative Accuracy ±0.1 Relative Accuracy Polarographic: ±0.2mg/L, ±2%, RDO optical: ±0.1mg/L up to 8mg/L, ±0.2mg/L up to 20mg/L, 10% of reading beyond, ±2% Calibration Water-saturated air, air-saturated water, manual (Winkler) and zero point Inputs BNC, reference pin, 8-pin mini-DIN, 9-pin mini-DIN Data Management 5000 datalogs with date/time stamp Output RS-232, USB Display Graphic LCD, simultaneous display of measurement, temperature, date/time, sample ID, user ID and more Warranty Period Three-year meter replacement