2-Pack TDS Water Quality Test Pen | 0–9990 ppm Precision Meter
2-Pack TDS Water Quality Test Pen | 0–9990 ppm Precision Meter
Know What's in Your Water — Instantly
Get confident about your drinking water with the TDS-3 Water Quality Test Pen (Pack of 2). This compact, pen-style TDS meter measures Total Dissolved Solids in seconds, giving you a clear digital reading so you can verify the quality of tap water, filtered water, pool water, aquarium water, and more. Made in Mainland China and CE certified for your peace of mind.
Key Specifications
- Model: TDS-3
- Measurement Range: 0–9,990 ppm
- Resolution: 1 ppm
- Readout Accuracy: ±2%
- Temperature Measurement: 31–200°F
- Power Supply: 2 × 1.5V LR44 button-cell batteries (not included)
- Certification: CE
- Pack Contents: 2 × TDS-3 test pens
Where Can You Use It?
This versatile water tester is perfect for a wide range of everyday and professional uses:
- 🏠 Household drinking water — tap water, spring water, filtered water
- 🌿 Hydroponics & gardening — monitor nutrient levels in grow water
- 🏊 Pools & spas — keep water conditions balanced
- 🐠 Aquariums & reef tanks — maintain the ideal environment for fish
- 💧 Water filters — test effectiveness of RO systems, Brita filters, carbon filters, refrigerator filters, and water ionizers
Smart Features for Everyday Convenience
- ✅ Hold function — saves your reading for convenient recording
- ✅ Auto-off — shuts down after 10 minutes of inactivity to extend battery life
- ✅ Ultra-portable — one of the smallest and lightest TDS meters available
- ✅ Advanced microprocessor — delivers stable, highly accurate readings every time
- ✅ Bulk value pack — includes 2 pens so you always have a spare or can share with a family member
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Frequently Asked Questions
Q: What does the TDS-3 water quality test pen actually measure?
A: The TDS-3 measures Total Dissolved Solids (TDS) in water, expressed in parts per million (ppm). A lower TDS reading generally indicates purer water. It can measure across a wide range of 0–9,990 ppm with a resolution of 1 ppm and ±2% readout accuracy, making it suitable for drinking water, aquariums, pools, and hydroponics.
Q: Do batteries come included with the TDS water tester pens?
A: No, batteries are not included. Each TDS-3 pen requires 2 × 1.5V LR44 button-cell batteries, which are widely available at most electronics or grocery stores.
Q: Can I use these TDS pens to test my water filter's effectiveness?
A: Absolutely! Simply test your water before and after it passes through your filter (reverse osmosis, carbon filter, Brita, refrigerator filter, etc.). A noticeable drop in TDS reading indicates your filter is working effectively at reducing dissolved solids.
Q: Why buy a 2-pack of TDS test pens?
A: The 2-pack offers excellent value — keep one in the kitchen and one near your aquarium or garden setup, or share with a family member. Having a backup also ensures you're never without a tester if one needs a battery replacement.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.