Feature: TDS sensor kit is compatible with for Arduino controllers, plug and play, easy to use. It can be applied to measure TDS value of the water, to reflect the cleanliness of the water. TDS (Total Dissolved Solids) indicates that how many milligrams of soluble solids dissolved in one liter of water. In general, the higher the TDS value, the more soluble solids dissolved in water, and the less clean the water is. Therefore, the TDS value can be used as one of the references for reflecting the cleanliness of water. Measuring the TDS value in the water is to measure the total amount of various organic or inorganic substances dissolved in water, in the unit of ppm or milligrams per liter (mg/l). Its Electrode can measure conductive materials, such as suspended solids, heavy metals and conductive ions in water. The module comes with four 3.2mm fixed holes, easy to mount on any other devices. Specification: TDS instrument: 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% F.S. (25) Module interface: XH2.54-3P Electrode interface: XH2.54-2P TDS probe: Number of needles: 2 Total length: 60cm Connection interface: XH2.54-2P Other: Waterproof probe Product size: 42 x 32 x 5mm Product weight: 25g color: Black Material: ABS Package Contents: 1 x TDS Sensor Meter 1 x TDS probe 1 x sensor wire Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.