Product Product subtotal Quantity Price Product subtotal
TDS Sensor SEN0244 — Water Quality (Total Dissolved Solids)
TDS Sensor SEN0244 — Water Quality (Total Dissolved Solids)
TDS Sensor SEN0244 — Water Quality (Total Dissolved Solids)
R 323.00
R 350.00/ea
 R 0.00
R 323.00
R 350.00/ea
 R 0.00
1 1

TDS Sensor SEN0244 — Water Quality (Total Dissolved Solids)

TDS Sensor SEN0244 — Water Quality (Total Dissolved Solids)

R 350.00 ZAR
R 323.00 ZAR R 350.00 ZAR
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39 in stock

🧪 TDS Sensor (SEN0244) — Total Dissolved Solids Water Quality Meter (Analog, 3.3–5V)

A TDS (Total Dissolved Solids) sensor module for measuring water quality. TDS indicates the total concentration of dissolved substances (minerals, salts, metals) in water — measured in parts per million (ppm). The module includes a waterproof probe and a signal board that outputs an analog voltage proportional to TDS level. Connect to the ADC pin of an ESP8266, ESP32, Arduino, or Raspberry Pi to build a smart water quality monitor for drinking water, borehole water, pool water, aquaculture, or hydroponics.

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🧪
0–1000 ppm
TDS Range
⚡
3.3–5V
Analog Output
⚠️ Requires a microcontroller. This sensor outputs an analog voltage — it does NOT have a display, WiFi, or standalone readout. You need an ESP8266 (D1 Mini, NodeMCU), ESP32, or Arduino to read the analog value and convert it to ppm. Do NOT leave the probe permanently submerged — prolonged immersion degrades the electrodes.

⚡ Key Features

  • TDS Measurement (0–1000 ppm) — measures total dissolved solids including minerals, salts, and metals; higher ppm = more dissolved substances
  • Waterproof Probe — stainless steel electrode probe on a cable; dip into water to measure, remove after reading
  • Signal Board with Analog Output — converts the probe reading to an analog voltage (0–2.3V); connect to the ADC pin of your microcontroller
  • 3.3V or 5V Compatible — works with both 3.3V (ESP8266/ESP32) and 5V (Arduino) systems
  • Temperature Compensation — the signal board includes on-board temperature compensation for more accurate readings
  • ESPHome / Home Assistant — read the analog value with the ESPHome adc sensor, apply a calibration lambda, and display TDS in ppm on your Home Assistant dashboard
  • Arduino Libraries Available — DFRobot provides example code and libraries for quick integration

🏠 Perfect For

🚰

Drinking Water Quality

Monitor municipal tap water or filtered water TDS. SA municipal water is typically 50–200 ppm. If TDS spikes above your baseline, it could indicate a supply problem or filter failure. Track trends in Home Assistant.

🕳️

Borehole Water Testing

Borehole water quality varies significantly across SA. Regular TDS monitoring helps detect mineral changes, salination, or contamination trends over time. Combine with pH monitoring for a comprehensive picture.

🌱

Hydroponics & Aquaponics

TDS (often expressed as EC — electrical conductivity) is critical for nutrient solution monitoring. Track nutrient concentration and alert when levels drift outside your target range.

🏊

Pool & Spa Water

High TDS in pool water (>1500 ppm) indicates excessive dissolved minerals and chemicals that reduce sanitiser effectiveness. Monitor TDS to know when it's time for a partial water change.

📊 TDS Reference Values (South Africa)

0–50 ppm — very pure water (RO filtered, distilled)
50–200 ppm — typical SA municipal tap water (Johannesburg ~80–120 ppm)
200–500 ppm — acceptable but mineral-rich (some borehole water)
500–1000 ppm — high TDS, may taste salty or metallic; consider filtration
>1000 ppm — not recommended for drinking without treatment

💡 Probe longevity tip: Do NOT leave the TDS probe permanently submerged in water. The electrodes will degrade over time through electrolysis. Instead, dip the probe for readings and remove it. For continuous monitoring, take readings every 15–30 minutes using ESPHome and lift/submerge the probe using a mechanical arm, or accept a shorter probe lifespan.

📋 Technical Specifications

Product TDS Sensor Module (SEN0244)
Model SEN0244 (DFRobot compatible)
TDS Range 0–1000 ppm
Output Analog voltage (0–2.3V)
Working Voltage 3.3–5V DC
Accuracy ±10% (25°C)
Temperature Compensation Built-in on signal board
Probe Waterproof stainless steel electrodes with cable
Interface Analog (ADC pin)
Compatible With ESP8266 · ESP32 · Arduino · Raspberry Pi · ESPHome · Home Assistant
In the Box 1 × TDS probe (with cable) · 1 × Signal board

🔗 Pair With

ESP8266 · WiFi · ADC

D1 Mini

Connect the TDS signal board to the A0 analog pin. Read TDS values via ESPHome and display on your Home Assistant water quality dashboard.

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ESP8266 · WiFi · Breadboard

NodeMCU ESP8266

Larger board with breadboard-friendly layout. Ideal for prototyping multi-sensor water quality stations (TDS + temp + flow).

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❓ Frequently Asked Questions

What does TDS actually measure?
Total Dissolved Solids — the combined content of all inorganic and organic substances dissolved in water. This includes minerals, salts, metals, and other dissolved compounds. TDS is measured in parts per million (ppm). It's an indicator of overall water quality, not specific contaminants. A high TDS doesn't necessarily mean unsafe water, but it indicates high mineral/salt content.
Can I leave the probe in water permanently?
Not recommended. The stainless steel electrodes degrade through electrolysis when continuously submerged and energised. For best probe lifespan, dip to measure and then remove. If you need continuous monitoring, power the probe intermittently (e.g. every 15 minutes) rather than constantly.
Can I use this with the ESP8266 (D1 Mini / NodeMCU)?
Yes. The ESP8266 has a single ADC pin (A0). Connect the TDS signal board output to A0. Note: the ESP8266 ADC range is 0–1V, but the NodeMCU and D1 Mini have an on-board voltage divider that scales it to 0–3.3V. The TDS signal board outputs up to 2.3V, which is within range.
Is TDS the same as EC?
Related but not identical. EC (Electrical Conductivity) measures how well water conducts electricity (in µS/cm or mS/cm). TDS is calculated from EC using a conversion factor (typically TDS = EC × 0.5–0.7). For hydroponics, EC is the more common measurement. This sensor measures EC internally and converts to TDS.

🤝 Need Help? We're Here for You!

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Call Us

Jesse: 071 678 8719
Jason: 084 505 7481

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8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709

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Email

info@eiferer.co.za

Test Your Water Quality 🧪

Smart TDS monitoring for borehole, tap, pool, and hydroponic water.

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