To understand the approximate conductivity value of the measured water quality, the meter ranges are: 1. 0-20 μS/cm (applicable to the conductivity measurement of secondary reverse osmosis effluent) 2. 0-20/200/2000 μS/cm (applicable to water inlet, conductivity measurement of first and second reverse osmosis effluent water) is the most commonly used 3. 0-20/200/2000 ppm (applicable to influent water, TDS measurement of primary and secondary reverse osmosis effluent) 4. 0-20mS/cm (20,000 μS/cm) (applicable to the measurement of high conductivity influent water conductivity) 5. 0-200mS/cm (200,000 μS/cm) (suitable for ultra-high conductivity measurement of influent water conductivity) 6. 0--18.25MΩ·cm (applicable to the measurement of resistivity of high-purity water such as EDI or mixed bed) Power supply Understand the power supply that can be provided, usually the specifications are AC 220V/110V; DC 24V Commonly used power supplies are: AC 220V, DC 24V Foreign trade customers may use AC 110V Do you need to output? 1 The instrument is subdivided into: 2 Display only, without any function output Most commonly used 3 with current output 4 with control output 5 has current and control output With current and control and 485 communication output External dimensions of the instrument The instrument has two dimensions: 1 48x96 Most commonly used 2 96x96