Ppm Tester
Portable digital meter for measuring total dissolved solids, electrical conductivity, and temperature in aqueous solutions with LCD display and automatic shutoff.
| Model | TDS-039 |
| Automation Level | manual |
| Brand | ConductScience |
The TDS-039 PPM Tester is a portable digital instrument for measuring total dissolved solids (TDS), electrical conductivity (EC), and temperature in aqueous solutions. This handheld meter employs conductivity measurement principles to determine ion concentration, providing quantitative data for water quality assessment and solution monitoring applications.
The instrument features an LCD digital display with automatic temperature compensation and power management including auto-shutoff after 10 minutes of non-use. The TDS-039 is designed for field and laboratory use where rapid, on-site water quality measurements are required for research protocols, environmental monitoring, and quality control applications.
How It Works
The TDS-039 operates on the principle that electrical conductivity of an aqueous solution is directly proportional to the concentration of dissolved ionic species. When electrodes are immersed in solution, mobile ions carry electrical current between the electrodes. The instrument measures this conductance and applies a conversion factor to estimate total dissolved solids content.
The meter employs a built-in temperature sensor to provide automatic temperature compensation, as conductivity varies predictably with temperature. The instrument calculates both the direct electrical conductivity (EC) measurement and the derived TDS value using standard conversion algorithms. Temperature readings allow users to account for thermal effects on sample properties and measurement accuracy.
Features & Benefits
Model
- TDS-039
Automation Level
- manual
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Materials Science
- Microbiology
- Pharmaceutical QC
Weight
- 0.03 kg
Dimensions
- L: 20.0 mm
- W: 10.0 mm
- H: 5.0 mm
Comparison Guide
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Parameter measurement | Measures TDS, EC, and temperature | Basic models often measure only TDS or conductivity | Triple parameter capability reduces need for multiple instruments during field sampling |
| Display type | LCD digital display | Analog meters or basic digital displays | Clear numerical readouts eliminate interpretation errors common with analog scales |
| Power management | Auto-shutoff after 10 minutes | Manual power control only | Automatic power management extends battery life during extended field work sessions |
| Temperature compensation | Automatic temperature compensation | Manual temperature correction required | Eliminates calculation errors and provides temperature-corrected readings automatically |
The TDS-039 combines triple parameter measurement with automatic temperature compensation and power management features. The digital display and included protective case support field use applications where multiple water quality parameters are needed simultaneously.
Practical Tips
Verify instrument accuracy using certified TDS standard solutions before beginning measurement sessions.
Why: Calibration drift can occur over time and affect measurement reliability in quantitative applications.
Store electrodes in distilled water or proper storage solution when not in active use.
Why: Proper storage prevents electrode fouling and maintains measurement sensitivity.
Allow readings to stabilize for 30-60 seconds before recording values, especially in temperature-variable samples.
Why: Thermal equilibration and electrode response time affect measurement accuracy.
Rinse electrodes between samples to prevent cross-contamination when measuring multiple solutions.
Why: Residual salts from previous samples can bias subsequent measurements.
If readings appear unstable, check for air bubbles on electrode surfaces and ensure proper immersion depth.
Why: Air bubbles or insufficient immersion create inconsistent electrical contact affecting measurement precision.
Record sample temperature alongside TDS and EC values for complete measurement documentation.
Why: Temperature data enables post-measurement corrections and provides context for solution behavior analysis.
Setup Guide
What’s in the Box
- TDS-039 digital meter
- Protective carrying case
- User manual (typical)
- Batteries (typical)
- Calibration solution samples (typical)
Warranty
ConductScience provides standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support for operation and maintenance questions.
Compliance
What is the measurement range and accuracy for TDS measurements?
Consult the product datasheet for specific TDS measurement range, resolution, and accuracy specifications as these parameters vary by model configuration.
How do I calibrate the instrument for accurate measurements?
Calibration typically involves measuring standard solutions of known TDS concentration and adjusting instrument settings accordingly. Follow calibration procedures outlined in the user manual using certified reference standards.
Can this meter be used for high-temperature samples?
The instrument includes temperature measurement and compensation, but consult specifications for maximum operating temperature limits to avoid damage to electrodes or electronics.
What maintenance is required for the electrodes?
Rinse electrodes with distilled water after each use, store with protective cap, and periodically check for buildup or damage that could affect measurement accuracy.
How does sample volume affect measurement accuracy?
Ensure electrodes are fully immersed in sample with sufficient volume around the probe to avoid wall effects or electrode interference with container surfaces.
Can I log or export measurement data?
The basic LCD display model provides real-time readings for manual recording. Consult product specifications to determine if data logging or digital interface capabilities are available.
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