Combination pH/EC/TDS/Temperature Tester ST 129
The ST 129 Combination waterproof tester offer high accuracy pH, EC/TDS and temperature measurements in a single tester. No more switching between meters for your routine measurements. The waterproof Combo (it even floats) has a large easy-to-read, dual-level LCD and automatic shut-off. pH and EC/TDS readings are automatically compensated for the effects of temperature (ATC). This technologically advanced tester has a replaceable pH electrode cartridge with an extendable cloth junction as well as an EC/TDS graphite electrode that resists contamination by salts and other substances. This gives these meters a greatly extended life. Your tester no longer needs to be thrown away when the pH sensor is exhausted.
The EC/TDS conversion factor is user selectable as is the temperature compensation coefficient (ß). Fast, efficient, accurate and portable, the Combo pH, EC/TDS and temperature tester brings you all the features you’ve asked for and more!
Specification :
| Range | pH | 0.00 to 14.00 pH |
| Range | EC | 0 to 3999 µS/cm |
| Range | TDS | 0 to 2000 ppm |
| Range | Temperature | 0.0 to 60.0°C / 32 to 140.0°F |
| Resolution | pH | 0.01 pH |
| Resolution | EC | 1 µS/cm |
| Resolution | TDS | 1 ppm |
| Resolution | Temperature | 0.1°C / 0.1°F |
| Accuracy | pH | ±0.05 pH |
| Accuracy | EC/TDS | ±2% F.S. |
| Accuracy | Temperature | ±0.5°C / ±1°F |
| Temperature Compensation | pH: automatic; EC/TDS: automatic with ß adjustable from 0.0 to 2.4% / °C | |
| Calibration | pH | automatic, 1 or 2 points with 2 sets of memorized buffers (pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18) |
| Calibration | EC/TDS | automatic, 1 point |
| TDS Conversion Factor | adjustable from 0.45 to 1.00 | |
| pH Electrode | (replaceable; included) | |
| Environment | 0 to 50°C (32 to 122°F); RH max 100% | |
| Battery Type / Life | 4 x 1.5V / approx. 100 hours of continuous use; auto-off after 8 minutes of non-use | |
| Dimensions | 163 x 40 x 26 mm (6.4 x 1.6 x 1.0″) | |
| Weight | 100 g (3.5 oz.) |
All-in-One Water Quality Testing with the Combination pH/EC/TDS/Temperature Tester ST 129
Simplify field and lab water analysis with the Combination pH/EC/TDS/Temperature Tester ST 129—a compact, multifunction handheld meter that delivers four critical water quality parameters in a single device. Engineered for aquaculture, hydroponics, environmental monitoring, food processing, and pool/spa maintenance, the ST 129 provides fast, accurate readings of pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and Temperature—eliminating the need for multiple instruments and streamlining your workflow.
Engineered for Convenience, Accuracy, and Durability
The ST 129 Combination Tester integrates a replaceable pH electrode and a four-ring EC/TDS sensor into one rugged probe, ensuring reliable performance across diverse samples—from freshwater and nutrient solutions to brackish water and process streams. Its automatic temperature compensation (ATC) corrects EC/TDS and pH readings in real time, while the backlit LCD displays all four parameters simultaneously for instant assessment.
- Four Parameters in One Device – pH (0.00–14.00), EC (0–20 mS/cm), TDS (0–10,000 ppm), and Temp (0–100°C / 32–212°F).
- High Accuracy – ±0.01 pH, ±1% EC/TDS, ±0.5°C temperature for dependable results.
- Automatic Calibration & Compensation – 1–3 point pH calibration; auto-recognized buffers; ATC for all parameters.
- IP67 Waterproof & Dustproof – Withstands splashes, rain, and temporary submersion—ideal for field use.
- Replaceable Dual-Sensor Probe – Easy maintenance; no need to replace the entire unit when sensors age.
- Long Battery Life (500+ Hours) – Auto-off function; uses standard AAA batteries for field convenience.
Trusted Across Water-Dependent Industries
From optimizing nutrient strength in hydroponic farms and monitoring fish tank health to verifying rinse water purity in food plants or checking irrigation salinity, the ST 129 supports HACCP, EPA, and ISO guidelines with consistent, traceable data. Its intuitive design requires minimal training—making it perfect for technicians, growers, inspectors, and educators alike.
Whether you’re managing a greenhouse, testing well water, or maintaining a commercial aquarium, the Combination pH/EC/TDS/Temperature Tester ST 129 gives you a complete water profile—in seconds.
One meter. Four essential parameters. Total water insight.
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