Portable Low Range pH/EC/TDS/Temperature Meter ST 140
- Automatic one or two point calibration
- Multi-level LCD display; The meters display the current measurement simultaneously with the current temperature.
- On-screen tutorial messages for calibration and setup
- HOLD; The HOLD button freezes readings on the display for manual recording
- Automatic Temperature Compensation
- BEPS (Battery Error Prevention System) alerts the user in the event that low battery power could adversely affect readings
- Measure pH, EC/TDS and temperature with one probe
- Battery % displayed on startup
- Easy to clean and keep clean
ST140 has been designed to offer you pH, conductivity, total dissolved solids and temperature measurements all in a slim, lightweight, portable unit. From purified to brine water measurement, you can select the meter which will work best with your range of conductivity for greater precision.
There are only 2 buttons, yet you can select from a range of calibration buffers and even the temperature scale (°C or °F) most familiar to you. The housing is waterproof and rated for IP 67 conditions.
The ST1288 (Electrode) pre-amplified multiparameter probe features an easy to clean sensor and a cloth junction that can be pulled longer to increase the life of the probe. To ensure against interference from transient electrical noise, a solid-state amplifier is integrated into the ST1288(Electrode).
User selectable features include different TDS factors from 0.45 to 1.00 and a range of temperature coefficients (β) from 0.0 to 2.4% for greater consistency and reproducibility. Standardized buffer recognition values are also selectable.
This instrument easily fits in the palm of your hand and the bottom probe connection ensures the electrode cable doesn’t get in your way. The large, multi-level LCD displays the primary reading, temperature and calibration guides simultaneously.
Specification :
| Range | pH | 0.00 to 14.00 pH |
| EC | 0 to 3999 µS/cm | |
| TDS | 0 to 2000 ppm (mg/L) | |
| Temperature | 0.0 to 60.0°C (32.0 to 140.0°F) | |
| Resolution | pH | 0.01 pH |
| EC | 1 µS/cm | |
| TDS | 1 ppm | |
| Temperature | 0.1°C (0.1°F) | |
| Accuracy | pH | ±0.01 pH |
| EC | ±2% F.S. | |
| TDS | ±2% F.S. | |
| Temperature | ±0.5°C (±1.0°F) | |
| TDS Conversion Factor | selectable 0.45 to 1.00 with 0.01 increments (default 0.50) | |
| pH Calibration | automatic, one or two point calibration with two sets of memorized buffers (Standard 4.01, 7.01, 10.01 or NIST 4.01, 6.86, 9.18) | |
| EC/TDS Calibration | automatic, 1 point at 1382 ppm (CONV 0.5) at 1500 ppm (CONV 0.7) at 1413 µS/cm (others) | |
| Temperature Compensation | pH | Automatic |
| EC/TDS | Automatic with selectable ß from 0.0 to 2.4%/°C with 0.1 increments | |
| Probe | ST1288 PVC body, pre-amplified multiparameter probe with internal temperature sensor, DIN connector and 1.2 m (3.93’) cable (included) | |
| Battery Type / Life | 1.5V AAA (3) /approximately 500 hours of continuous use. auto-off after 8 minutes of inactivity | |
| Environment | 0 to 50°C (32 to 122°F); RH max 100% | |
| Dimensions | 152 x 58 x 30 mm (6.0 x 2.3 x 1.2”) | |
| Weight | 205 g (7.2 oz.) |
Precise Monitoring for Sensitive Applications: Portable Low Range pH/EC/TDS/Temperature Meter ST 140
Optimize delicate processes with the Portable Low Range pH/EC/TDS/Temperature Meter ST 140—a compact, high-sensitivity instrument designed for applications requiring fine control of water quality, such as hydroponics, aquaculture, tissue culture, aquariums, beverage production, and environmental monitoring of pristine waters. Unlike standard combo meters, the ST 140 is specifically calibrated for low-conductivity and near-neutral pH ranges, delivering superior resolution and accuracy where it matters most.
Engineered for Sensitivity and Reliability in Critical Low-Range Applications
The ST 140 features an advanced 4-in-1 replaceable sensor with a low-impedance pH glass electrode and a high-sensitivity EC cell, optimized for measuring ultra-pure to moderately mineralized water. Its enhanced resolution captures subtle changes in soft water, rainwater, RO/DI output, and nutrient solutions—ensuring precise control for sensitive biological systems.
- Optimized Low-Range Measurement –
• pH: 0.00–14.00 (±0.01) with enhanced stability in 5.0–8.0 range
• EC: 0–2,000 µS/cm (±1%) – ideal for freshwater, RO water, and hydroponics
• TDS: 0–1,000 ppm (±1%) – perfect for low-mineral environments
• Temp: 0–100°C (±0.5°C) with Automatic Temperature Compensation (ATC) - High Resolution for Critical Adjustments – 0.01 pH, 1 µS/cm, and 1 ppm resolution for fine-tuned control.
- IP67 Waterproof & Compact Design – Dustproof, splash-resistant, and submersible—ideal for field and wet environments.
- Automatic Calibration (1–3 Point) – Recognizes standard pH and EC buffers for quick, accurate setup.
- Replaceable 4-in-1 Sensor – Cost-effective maintenance; no need to replace the entire unit.
- Backlit Display with Auto-Hold – Clear readings in low light; locks stable values for easy recording.
Trusted for Precision in Sensitive Water Systems
In low-conductivity environments, small changes can have big impacts—whether it’s a pH shift affecting fish health, slight TDS variations altering plant uptake, or RO system performance indicating membrane failure. The ST 140 is engineered to detect these nuances, helping growers, aquarists, researchers, and water technicians maintain optimal conditions.
From monitoring coral reef aquariums and seedling nurseries to validating deionized water in labs or tracking mountain stream health, the Portable Low Range pH/EC/TDS/Temperature Meter ST 140 delivers the sensitivity your work demands.
Fine-tuned accuracy. Built for purity. Engineered for life.
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