Introduction
Product Definition
The A29 TDS water testing pen is a portable water quality testing tool used to quickly measure the total dissolved solids (TDS) in water, helping users preliminarily assess water purity. It is suitable for water quality testing of household tap water, well water, mountain spring water, drinking water, and effluent from various water purifiers.
Product Features
- One-button power-on and one-button value hold for simple and convenient operation.
- Equipped with a high-precision sensor, with a measurement error range of ±2%.
- Features an LCD display for clear and easy-to-read test results.
- Lightweight body with anti-slip dot design for easy handheld use and portability.
- Supports testing of multiple water sources, including pure water, purifier effluent, tap water, well water, mountain spring water, and more.
Core Specifications
- Measurement range: 0-999ppm
- Measurement error: ±2%
- Working water temperature: 0-50°C
- Power supply: LR44 button cell battery
- Display: LCD screen
- Body design: anti-slip dot design, lightweight and portable
Usage Scenarios
- Quick quality testing of household tap water.
- Preliminary safety screening of outdoor water sources such as well water and mountain spring water.
- Verification of purification performance of water purifiers (RO systems, ultrafiltration purifiers, functional purifiers).
- Routine water quality monitoring in the drinking water and water treatment industries.
FAQ
Q: How do I turn on the device and start testing?
Press the 【ON/OFF】 button to turn it on, then insert the pen into the water (mind the water level line and do not exceed it). When the reading stabilizes, press the 【HOLD】 button to lock the value.
Q: What TDS value indicates good water quality?
A TDS value of 0-50ppm indicates extremely high purity, 50-100ppm indicates relatively high purity, and 100-300ppm indicates average purity. The acceptable TDS range for humans is below 300ppm.
Q: What does a TDS value above 300 indicate?
A TDS value of 300-600ppm tends to cause scale buildup, and filtration is recommended; 600-1000ppm indicates heavy contamination; above 1000ppm indicates severe contamination.
Q: Can I continue testing after pressing the 【HOLD】 button?
After pressing the 【HOLD】 button, the device must be powered off and on again before the next test can be performed.
Q: Does the TDS value fully represent water quality?
No. The TDS value is only one indicator in water quality testing, and water quality cannot be judged by the TDS value alone.
Related Terms
- TDS: Total Dissolved Solids, measured in ppm (parts per million).
- ppm: parts per million, a concentration unit representing one part per million.
- RO system: Reverse osmosis water purifier, featuring high filtration precision and effectively reducing TDS levels.
- Ultrafiltration purifier: Uses an ultrafiltration membrane to remove macromolecular impurities, but has limited effect on reducing TDS levels.
- Anti-slip dots: Raised dot patterns on the device body designed to improve handheld grip.

