Gravity: Analog TDS Sensor/Meter for Arduino is an Arduino-compatible TDS Meter Kit for measuring TDS value of the water, to reflect the cleanliness of the water. TDS meter can be applied to domestic water, hydroponic and other fields of water quality testing. You may also check Liquid Senser Selection Guide to get better familiar with our liquid sensor series. 

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.
TDS pen is widely used equipment to measure TDS value. The price is affordable, and it is easy to use, but it is not able to transmit data to the control system for online monitoring to do some water quality analysis. The professional instrument has high accuracy and can send data to the control system, but the price is expensive for ordinary people. To this end, we have launched an analog TDS sensor kit that is compatible with Arduino, plug, and play, easy to use. Matching with Arduino controller, you can build a TDS detector easily to measure the TDS value of liquid.
This tds sensor supports 3.3 ~ 5.5V wide voltage input, and 0 ~ 2.3V analog voltage output, which makes it compatible with a 5V or 3.3V control system or board. The excitation source is an AC signal, which can effectively prevent the probe from polarization and prolong the life of the probe, meanwhile, increase the stability of the output signal. The TDS probe is waterproof, it can be immersed in water for a long time measurement.
This tds meter can be used in water quality application, such as domestic water, hydroponics. With this product, you can easily DIY a TDS detector to reflect the cleanliness of water to protect your health.
If you want to make a simple water purifier, we recommend buying together with Gravity: Waterproof DS18B20 Sensor Kit

Attention:
1.The probe can not be used in water above 55 degrees centigrade.
2.The probe can not be left too close to the edge of the container, otherwise, it will affect the reading.
3.The head and the cable of the probe are waterproof, but the connector and the signal transmitter board are not waterproof. Please be careful.

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 Needles: 2

Total Length: 83cm

Connection Interface: XH2.54-2P

Color: Black

Other: Waterproof Probe

Project 1. Arduino Hydroponics, DIY Hydroponics System using pH Sensor& EC Sensor, Hydroponic

Project 2. TDS Sensor & Arduino Interfacing for Water Quality Monitoring

Introduction: This project will interface Gravity Analog TDS Sensor with Arduino Microcontroller and read the value in 16×2 LCD Display.

Project 3. TDS Sensor and ESP32 IoT based Water Quality Monitoring system, IoT TDS sensor, ESP32 TDS Sensor

Introduction: This project show you how to make IoT based Water Quality Monitoring System using TDS Sensor, DS18B20 water proof one wire digital temperature sensor, and ESP32 Wifi + Bluetooth Module.