Water TDS Test Pen
Portable conductometric meter measuring total dissolved solids (0-9999 ppm) and electrical conductivity (0-9999 μS/cm) with integrated temperature sensing for water quality assessment.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Configured during quote
- SKU family
- CS-LH-TDS005
- Sizing
- 20.0 x 10.0 x 5.0 cm
- Ordering
- Online checkout and quote request available
- Category
- Portable Analyzers
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The Water TDS Test Pen is a portable conductometric instrument for quantitative assessment of total dissolved solids and electrical conductivity in aqueous samples. The device measures TDS across a 0-9999 ppm range and conductivity from 0-9999 μS/cm using conductometric detection principles. Temperature measurement capability (0-80°C) enables temperature-corrected readings for accurate water quality assessment.
This dual-function meter employs digital conductivity measurement to determine ion concentration in water samples. The instrument provides immediate quantitative feedback for water treatment monitoring, environmental sampling, and quality control applications where dissolved ion content must be characterized. The compact form factor and battery operation enable field measurements without laboratory infrastructure.
How It Works
The TDS test pen operates on conductometric principles, measuring the electrical conductivity of water to determine total dissolved solids concentration. When dissolved ions are present in water, they create conductive pathways between the instrument's electrodes. The meter applies a small electrical potential across these electrodes and measures the resulting current flow, which correlates directly with ion concentration.
The instrument converts conductivity measurements to TDS values using established correlation factors, as TDS represents the sum of all dissolved ionic and non-ionic substances. Temperature compensation is integrated into the measurement process, as conductivity varies significantly with temperature. The digital display presents results in parts per million (ppm) for TDS and microsiemens per centimeter (μS/cm) for conductivity.
Dual-range measurement capability allows assessment of both low-conductivity purified water and higher-conductivity process or environmental samples. The temperature sensor provides simultaneous thermal measurement for proper interpretation of conductivity data and environmental documentation.
Features & Benefits
Test Item
- Measuring Range
TDS
- 0-9999ppm
Conductivity
- 0-9999μS/cm
Automation Level
- manual
Brand
- ConductScience
Temperature Range
- 0-80â,32-176â
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Industrial Hygiene
- Materials Science
- Pharmaceutical QC
Weight
- 0.26 kg
Dimensions
- L: 20.0 mm
- W: 10.0 mm
- H: 5.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| TDS Measurement Range | 0-9999 ppm | Entry-level models often limited to 0-1999 ppm range | Extended range accommodates both purified water analysis and moderately contaminated environmental samples without range switching. |
| Conductivity Range | 0-9999 μS/cm | Basic meters may offer narrower ranges or require manual range selection | Wide single-range capability eliminates range selection errors and covers most water quality applications. |
| Temperature Measurement | Integrated 0-80°C sensing | Some models lack temperature measurement requiring separate thermometer | Simultaneous temperature measurement enables proper conductivity interpretation and environmental documentation. |
| Display Technology | Digital readout with push-button operation | Analog displays require interpretation and may be less precise | Eliminates reading interpretation errors and provides consistent numerical results across operators. |
| Portability Design | Pen-style with protective case and battery operation | Benchtop models require AC power and laboratory setup | Enables field sampling and on-site water quality assessment without laboratory infrastructure. |
The Water TDS Test Pen offers extended measurement ranges for both TDS and conductivity with integrated temperature sensing in a portable package. The combination of wide-range capability and field portability supports both laboratory and field water quality assessment applications.
Practical Tips
Verify calibration using potassium chloride reference solutions at 1413 μS/cm before critical measurements.
Why: KCl solutions provide stable, traceable conductivity standards for instrument verification.
Clean electrodes with distilled water after each use and store in the protective case.
Why: Electrode deposits from previous samples can cause measurement drift and cross-contamination.
Allow thermal equilibration between instrument and sample for 30 seconds before recording measurements.
Why: Temperature differences affect conductivity readings and measurement repeatability.
Record both TDS and conductivity values along with temperature for complete documentation.
Why: Temperature-corrected data enables proper interpretation and comparison with historical measurements.
If readings appear unstable, check for air bubbles on electrodes and ensure complete immersion.
Why: Air bubbles or partial immersion create inconsistent electrical contact and measurement errors.
Avoid measuring samples with extreme pH or organic solvents that may damage electrode materials.
Why: Chemical attack on electrodes reduces measurement accuracy and instrument lifespan.
Take multiple measurements and calculate averages for critical water quality assessments.
Why: Averaging reduces random measurement uncertainty and improves data reliability.
Setup Guide
What’s in the Box
- Water TDS Test Pen (main unit)
- Protective carrying case
- AG-13 button cell batteries (2) (typical)
- User manual and operation guide (typical)
- Calibration reference information (typical)
Warranty
ConductScience provides standard one-year manufacturer warranty covering defects in materials and workmanship. Technical support is available for calibration procedures and measurement troubleshooting.
Compliance
References
Background reading relevant to this product:
What is the measurement principle and how does TDS relate to conductivity?
The instrument measures electrical conductivity between electrodes and converts this to TDS using correlation factors. TDS represents total dissolved ionic species, which create conductive pathways proportional to ion concentration. The conversion factor typically assumes mixed ionic solutions with standard correlation ratios.
How should the instrument be calibrated for accurate measurements?
Calibration requires potassium chloride reference solutions at known conductivity values (typically 1413 μS/cm at 25°C). Immerse electrodes in reference solution, compare displayed values to known standards, and adjust if deviation exceeds acceptable limits. Calibration frequency depends on measurement accuracy requirements and usage conditions.
What factors affect measurement accuracy and precision?
Temperature significantly affects conductivity readings, requiring thermal equilibration between sample and instrument. Electrode cleanliness, sample depth coverage, and ionic composition influence accuracy. Air bubbles on electrodes and electrode polarization in high-conductivity samples can introduce measurement errors.
How does this method compare to gravimetric TDS determination?
Conductometric measurement provides rapid results but measures only ionic species, while gravimetric analysis quantifies all dissolved matter including non-ionic compounds. Conductometric methods are suitable for process monitoring but gravimetric analysis remains the reference method for total dissolved solids determination.
What is the expected battery life and measurement frequency capability?
AG-13 button cells typically provide several hundred measurements depending on display usage and ambient conditions. Battery life varies with measurement frequency and temperature extremes. Low battery indicators help prevent measurement errors from insufficient power supply.
Can this instrument measure samples with extreme pH or chemical composition?
The meter is designed for aqueous solutions within normal pH ranges. Extreme pH conditions may affect electrode performance and measurement accuracy. Strong acids, bases, or organic solvents can damage electrodes or produce erroneous readings due to non-ionic conductivity mechanisms.
What maintenance procedures are required for reliable operation?
Regular electrode cleaning with distilled water removes accumulated deposits. Storage in protective case prevents mechanical damage. Periodic calibration verification ensures measurement accuracy. Electrode replacement may be necessary after extended use in contaminated samples or chemical exposure.
How should measurement uncertainty be evaluated for quality control purposes?
Measurement uncertainty includes instrument precision, calibration standard uncertainty, temperature effects, and sampling variability. Multiple measurements on the same sample provide precision estimates. Comparison with reference methods or certified reference materials validates measurement accuracy for quality control applications.
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