# TDS sensor module, water quality, analog probe, 3.3-5V

> TDS sensor module for measuring water conductivity and estimating TDS, with a stainless steel probe (length ~60 mm, diameter 12 mm, cable ~60 cm). Power supply 3.3-5.5 VDC, current 3-6 mA, analog output 0-2.3V, measuring range 0-1000 ppm, accuracy ±10% F.S. (25°C), operating temperature 5~55°C. Module dimensions 41.7 x 32.2 mm. Suitable for aquariums, hydroponics and educational projects with Arduino.

- Page: https://sigmanortec.ro/en/tds-sensor-module-water-quality-analog-probe-33-5v
- Price: 28.47 RON
- Availability: In stock; 1-2 zile
- Reference: 88155 · EAN: 5942950913656
- Category: Mechatronics and IoT > Sensors and Modules > Level and Liquid Sensors
- Specifications: Input Voltage: 3.3 - 5 VDC; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Output signal type: Analogic
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 05:45 (Europe/Bucharest)

## Description

Water conductivity and TDS estimation module, ideal for monitoring water quality with Arduino and other compatible boards. It offers stable analog output for fast readings, operates at 3.3-5V with low power consumption, includes a durable stainless steel probe and easily integrates into aquariums, hydroponics, filters or educational projects.
This TDS module is designed to measure water conductivity and estimate the total dissolved solids concentration, offering a practical solution for water quality monitoring in projects with Arduino UNO and other compatible development boards.
It works by measuring electrical conductivity, where a higher amount of salts, minerals, or other dissolved substances causes an increase in conductivity.
The module provides an analog output proportional to this value, allowing the microcontroller to calculate the TDS level in ppm or electrical conductivity in µS/cm.
It can be powered between 3.3 and 5.5 VDC, has a low current consumption of 3 - 6 mA, and an analog interface of 0 - 2.3V, making it easy to integrate into water testing applications, hydroponics, aquaristics, filtration systems, or educational projects.
The stainless steel probe is resistant to repeated use, and the compact dimensions of the module allow easy mounting in various electronic assemblies.
Specifications:
Operating voltage: 3.3 - 5.5 VDC
Operating current: 3 - 6 mA
Interface: Analog 0 - 2.3V
Measurement range: 0 - 1000 ppm
Accuracy: ± 10% F.S. (25 ℃)
Probe material: Stainless steel
Probe length: ~ 60 mm
Probe diameter: 12 mm
Cable length: ~60 cm
Operating temperature: 5 ~ 55°C
Dimensions: 41.7 x 32.2 mm
Pinout:
Pin Number
Pin Name
Pin Description
1
A
Signal
2
+
Power Supply (3.3-5V)
3
Ground (GND)
Usage:
After powering, the module provides at the output an analog voltage proportional to the water conductivity. This value can be read by a microcontroller and converted into TDS ppm using the corresponding formula in software.
For the most accurate results, the probe must be kept fully immersed in water, without air bubbles on the electrode surfaces. Periodic cleaning of the probe is recommended to prevent deposits that can affect measurement accuracy.
The module is suitable for water monitoring in aquariums, hydroponic systems, educational experiments, and general water quality checking applications.
Standard Values:
Package Contents:
1x TDS Meter Module V1.0
1x Probe
1 x 3-wire Connector