TDS Meter Sensor Module with Probe Cable, Water Quality Total Dissolved Solids Measurement Board for Arduino & DIY Monitoring

Monitor water quality with a practical TDS (Total Dissolved Solids) meter sensor module designed for DIY electronics and automation projects. TDS is commonly used as an indicator of how much dissolved material is present in water (salts, minerals, and other dissolved ions). This makes TDS measurement useful in many everyday and technical applications—such as checking filtration performance, monitoring nutrient solutions, and maintaining consistent water conditions in aquariums or hydroponic systems.

This module provides a convenient way to add TDS sensing to your Arduino or microcontroller project. The included probe cable allows you to place the sensor in a reservoir, tank, or flowing water system while keeping the electronics module dry and safely mounted inside an enclosure. With its compact PCB layout and mounting holes, the board is easy to install and organize, especially in projects where you want a professional, serviceable setup rather than loose wiring.

TDS sensor modules like this are widely used in hydroponics and farming prototypes to track nutrient solution concentration. As nutrients and dissolved salts increase, the TDS value generally rises. Many makers use this data to build dashboards, alerts, or automated control systems that help maintain stable conditions. It’s also popular for aquarium monitoring, where sudden changes in dissolved solids can indicate water quality changes, evaporation effects, or filtration issues. For RO and filtration systems, TDS readings can help you compare input and output water quality and identify when filters or membranes may need maintenance.

For best results, proper calibration and temperature compensation are important. Water conductivity (which TDS sensing is based on) changes with temperature. Many DIY projects improve accuracy by adding temperature compensation in code using a separate temperature sensor, or by following the manufacturer calibration method for the probe and module. Always rinse the probe with clean water after use, avoid touching the sensing surface, and keep the probe free from heavy deposits that could affect readings. If you are measuring highly contaminated or chemically aggressive liquids, test compatibility first and clean the probe appropriately.

Because TDS is an indicator rather than a full laboratory analysis, it’s ideal for trends, comparisons, and control logic. Use it to monitor changes over time, trigger alarms when values exceed your chosen threshold, or maintain a target range in a nutrient tank. In education, it’s also a great module for learning about water conductivity, sensors, and real-time monitoring with microcontrollers.

Included: one TDS meter sensor module board and one wired probe/cable (as shown). Suitable for DIY water monitoring projects, prototyping, and automation systems where a compact and practical TDS solution is required.