Item Type: Analog TDS Sensor Input Voltage: DC 3.3 - 5.5V Output Voltage: 0-2.3V Working Current: 3-6mA TDS Measurement Range: 0-1000ppm TDS Measurement Accuracy: 10%FS (25) Module Interface: XH2.54-3P Electrode Interface: XH2.54-2P TDS Probe: Number of Needles: 2 Total Length: Approx. 83cm / 32.7in Connection Interface: XH2.54-2P Color: White Other: Waterproof probe TDS (Total Dissolved Solids) indicates how many milligrams of soluble solids are dissolved in one liter of water. Generally speaking, the higher the TDS value, the more soluble solids dissolved in water, and the less clean the water. Measuring the TDS value in water is to measure the total amount of various organic or inorganic substances dissolved in the water, in ppm or milligrams per liter (mg/l).1Plug and play, have humanized design, easy to install, convenient to use and operate. 2Can be used to measure the TDS value of water, reflecting the cleanliness of the water. 3The electrodes can measure conductive substances, such as suspended solids in water, heavy metals and conductive ions. 4The module has four 3. 2mm fixing holes for easy installation on any other equipment. 5Small in size and light in weight, convenient to carry and use at any time, very convenient and practical. 1 xAnalog&nbspTDS&nbspSensor 1 x Probe 1 x Sensor Line