Digital TDS Meter 0–9990 ppm Water Quality Tester

Know What's In Your Water — Instantly

The Digital TDS Meter gives you fast, accurate Total Dissolved Solids readings in seconds. Whether you're monitoring your drinking water, fine-tuning a hydroponic setup, maintaining a healthy aquarium, or keeping your pool and spa in balance, this pocket-sized tester puts professional-grade water quality data right at your fingertips.

Made in Mainland China.

Why Monitor TDS?

TDS (Total Dissolved Solids) measures the concentration of inorganic salts and organic matter — including calcium, magnesium, and sodium — dissolved in water. A low TDS reading typically indicates purer water, while a high reading can signal that filtration or water treatment is needed. Tracking TDS is essential for drinking water safety, hydroponic nutrient solutions, aquarium health, pool/spa maintenance, coffee brewing, kombucha fermentation, and laboratory use.

Key Features

• Wide Measurement Range: 0–9990 ppm — suitable for a huge variety of water sources
• ± 2% Accuracy: Reliable readings you can trust at home or in the field
• Large LCD Display: Easy-to-read digits even in low-light conditions
• Lock Function: Freeze the reading on-screen for convenient recording without having to hold the probe in place
• Handheld Pen Style: Slim, lightweight design slips easily into a pocket, bag, or lab coat
• Waterproof Body: Durable ABS plastic construction designed to handle wet environments (max immersion depth: 4 cm)
• Low-Power Processor: Maximises battery life for extended use

Specifications

Ideal Uses

• Drinking water & home filtration systems
• Hydroponics & aquaponics
• Aquariums & aquaculture
• Pool, hot tub & spa maintenance
• Coffee & kombucha brewing
• Car wash water quality
• Laboratory & scientific testing
• Ecology & colloidal silver testing

Important Usage Notes

• Do not immerse the meter in liquid beyond the maximum immersion level of 4 cm.
• Do not store in high temperatures or direct sunlight.
• Batteries (2 × LR44) are not included.

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Authoritative Resource

For more information on drinking water quality and what TDS levels mean for your health and home, 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 combined concentration of all inorganic and organic substances dissolved in water — such as calcium, magnesium, sodium, and other minerals — expressed in parts per million (ppm). The higher the ppm reading, the more dissolved solids are present in the water.

Q: What is a good TDS level for drinking water?

A: The EPA recommends a secondary guideline of 500 ppm or less for drinking water. Many people prefer water below 300 ppm for taste and quality. This Digital TDS Meter's 0–9990 ppm range lets you monitor both very clean and heavily mineral-laden water sources.

Q: Does this TDS meter come with batteries?

A: No — the meter requires 2 × LR44 button-cell batteries, which are not included. These are widely available at hardware stores, pharmacies, and online retailers.

Q: Can I use this TDS meter for my aquarium or hydroponics setup?

A: Absolutely. This meter is designed for a wide range of applications including aquariums, aquaculture, hydroponics, pools, spas, and more. Its 0–9990 ppm range covers the full spectrum of dissolved solids levels you'll encounter in these environments.

Q: How deep can I submerge the probe?

A: The meter is waterproof up to a maximum immersion depth of 4 cm (approximately 1.5 inches). Do not submerge beyond this level to protect the internal electronics.