Water conductivity sensor simulation TDS Meter V1.0 development board water Meter filter measurement sensor module
 
TDS (Total Dissolved Solids) measures how many milligrams of soluble solids dissolved in one liter of water. The measure is expressed in PPM (part per million). 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.  
Thanks to this product, it becomes possible to create your own measurement, collection and data transmission system. It is even possible to use this information to automate water treatment cycles. The TDS probe is waterproof; it can be immersed in water for long time measurement. However, the signal transmitter board is not waterproof. 
 
Specifications
Signal Transmitter Board
Input Voltage: 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 Size: 42 * 32mm
Module Interface: PH2.0-3P
Electrode Interface: XH2.54-2P
TDS probe
Number of Needle: 2
Total Length: 83cm
Connection Interface: XH2.54-2P
Colour: Black
Other: Waterproof Probe
 
Resources: 
1. TDS Meter using TDS & Temperature Sensor with Arduino (Youtube Video)
2. TDS sensor with arduino Tutorial from DF Robot WiKi
3.  TDS Sensor & Arduino Interfacing for Water Quality Monitoring