TDS Meter Water Quality Tester 0–9990ppm | TDS Pen

Know What's in Your Water — Instantly

The TDS Meter & Water Quality Tester gives you fast, accurate readings of total dissolved solids (TDS) in any water source. Whether you're checking your drinking water, brewing the perfect cup of coffee, monitoring your aquarium, or managing a hydroponics system, this compact TDS pen delivers reliable results in seconds. Made in Mainland China.

Why You'll Love This TDS Pen

• Wide 0–9990 ppm Range: Covers everything from ultra-pure RO water to heavily mineralized sources — one tool for every application.
• High Accuracy ±2%: Advanced electrode sensor technology ensures consistent, trustworthy measurements every time.
• Instant Digital Readout: Large LCD display shows results clearly within seconds of contact with water.
• Slim Pen Design: Fits easily in a pocket, drawer, or kit bag — perfect for home, lab, garden, or on the go.
• Auto-Off Function: Extends battery life by automatically powering down after non-use.
• Easy to Use: Simply remove the cap, dip the sensor tip into water, and read your result — no calibration or special training required.
• Multi-Use Versatility: Ideal for drinking water, coffee brewing, aquariums, hydroponics, swimming pools, and more.

Key Specifications

• Measurement Range: 0–9990 ppm
• Accuracy: ±2%
• Display: LCD digital screen
• Power: Battery-powered (included)
• Feature: Auto-off, waterproof tip
• Best For: Drinking water, coffee, aquariums, hydroponics, pools, RO systems
• Origin: Made in Mainland China

Who Is This For?

This TDS pen is ideal for home users wanting to verify tap or filtered water quality, hobbyist aquarium keepers tracking mineral levels, hydroponic growers optimizing nutrient concentration, and coffee enthusiasts dialing in the ideal water profile for extraction. One affordable tool that serves multiple everyday needs.

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Learn More About Water Quality

For information on drinking water quality standards and what dissolved solids mean for your health, visit the U.S. EPA Ground Water and Drinking Water resource.

Frequently Asked Questions

Q: What does a TDS meter actually measure?

A: A TDS (Total Dissolved Solids) meter measures the concentration of dissolved substances in water — including minerals, salts, and metals — expressed in parts per million (ppm). A lower ppm reading typically indicates purer water, while higher readings indicate more dissolved content. This TDS pen covers 0–9990 ppm, making it suitable for a wide variety of water sources.

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

A: Yes! This TDS meter is an excellent tool for aquarium keepers who need to monitor water mineral levels for fish health, and for hydroponic growers who want to ensure their nutrient solution is at the correct concentration. The wide 0–9990 ppm range and ±2% accuracy make it a versatile choice for both applications.

Q: How do I use and maintain the TDS meter?

A: Using the TDS meter is simple — remove the protective cap, turn it on, and dip the sensor tip approximately 2–3 cm into your water sample. The reading appears on the LCD within seconds. After use, rinse the sensor tip with clean water and replace the cap. The auto-off feature helps preserve battery life between uses.