Digital TDS EC PPM Water Quality Tester Meter | 0–9990 LCD Pen

3-in-1 Digital Water Quality Tester — TDS, EC & Temperature in One Pen

Keep your water clean and your family confident with this compact, easy-to-use Digital TDS EC PPM Water Quality Tester Pen. Whether you're checking tap water, filtered water, aquariums, hydroponics, or pool water, this pocket-sized meter gives you fast, accurate readings at a glance on its bright white LCD display.

Made in Mainland China.

• 3-in-1 Measurement: Simultaneously reads TDS (Total Dissolved Solids) in PPM, EC (Electrical Conductivity) in µS/cm, and Water Temperature in °C/°F — all from a single device.
• Wide Measurement Range: 0–9990 PPM / 0–9990 µS/cm; Temperature: 0.1–80.0°C (32.0–176.0°F); Accuracy: ±2%.
• Auto Temperature Compensation (ATC): Built-in ATC ensures readings stay accurate regardless of water temperature fluctuations.
• Data-Hold Function: Locks your reading on screen so you can record results easily — no more guessing or rushing.
• Large White LCD Display: Clear, backlit screen makes readings easy to see even in low light.
• Factory Calibrated & Ready to Use: Comes pre-calibrated right out of the box — just dip and read.
• Long Battery Life: Smart auto-off function conserves battery power; lower energy consumption than traditional TDS meters.
• Battery Included: Everything you need is in the box — just unwrap and start testing.

Ideal For:

• Drinking water & home filtration systems
• Aquariums & fish tanks
• Hydroponics & gardening
• Swimming pools & spas
• Reverse osmosis (RO) systems
• Laboratories & educational use

Technical Specifications

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Learn More About Water Quality

For guidance on safe drinking water standards and what TDS levels mean for your health, visit the CDC Healthy Water: Drinking Water resource page.

Frequently Asked Questions

Q: What does a TDS EC PPM meter measure and why does it matter?

A: A TDS (Total Dissolved Solids) EC (Electrical Conductivity) PPM meter measures the concentration of dissolved particles in water, expressed in parts per million (PPM) or microsiemens per centimeter (µS/cm). High TDS levels can indicate the presence of minerals, chemicals, or other substances in your water. Monitoring TDS helps you know when water filters need replacing and ensures your drinking or aquarium water remains within safe, optimal ranges.

Q: How do I use this digital water tester pen?

A: Simply remove the protective cap, turn on the device, and dip the metal probes into the water sample. The large LCD display will show TDS, EC, and temperature readings within seconds. Use the data-hold button to lock the reading on screen for easy recording. Rinse the probes with clean water after each use and replace the cap when storing.

Q: Is this TDS meter suitable for aquarium and hydroponics use?

A: Yes! This 3-in-1 digital water quality tester is widely used for aquariums, fish tanks, hydroponics systems, and gardening. Monitoring EC and TDS levels is essential for maintaining the right nutrient balance in hydroponic setups and ensuring a healthy environment for fish and aquatic life.

Q: Does this meter come calibrated, and can it be recalibrated?

A: Yes, this TDS EC meter comes factory calibrated and is ready to use straight out of the box. For most home and hobby applications, factory calibration provides reliable ±2% accuracy. Advanced users may refer to standard calibration solutions if fine-tuning is needed over time.

Q: What is the measurement range of this water quality tester?

A: This digital water tester covers a TDS range of 0–9990 PPM, an EC range of 0–9990 µS/cm, and a temperature range of 0.1–80.0°C (32.0–176.0°F), making it versatile for a wide variety of water testing applications.