Laboratory high-precision professional multi-parameter analysis tester, large color LCD display, acidity pH- REDOX mV- ion concentration ISE- conductivity EC- resistivity - total dissolved solids TDS- actual salinity (PSU) - seawater salinity (NaCI%) - temperature and other conventional important water quality indicators rapid and accurate measurement, Automatic identification of range range and unit conversion; New appearance design, along with the screen calibration operation procedure prompts, GLP function, quick query of relevant data, acidity check function, ion concentration increment measurement method, USP (645) in line with the international Pharmacopoeia measurement specifications, automatic identification calibration and user defined calibration, automatic end locking function, USB data interface, large capacity data storage, excellent data management.