General Purpose pH Meter ST 551
The ST551 General purpose pH meter pH is a high quality durable bench instrument ,also been called as Digital pH meter or pH Tester, it’s the device that do pH measurement for liquid. ORP (Oxidation Reduction Potential) Meter, also been called as Digital ORP Meter or ORP tester, it’s the device that do ORP measurement for liquid, both of them had been widely used in the Water Quality Testing applications.
The ST551 is ideally suited to busy laboratories and routine operations. Changes in temperature are catered for with the Automatic Temperature compensation function (ATC). The battery option (9V) provides flexibility and manual calibration controls enable the use of any buffer solutions for 5 point calibrations.
Any combination pH electrode with a BNC connector is compatible with the ST551 pH meter whilst use of a pH half-cell and separate reference electrode is made possible by the single 4mm Reference electrode socket.
pH/ORP meters features:
Multi Display pH / mV, with Temp. & real time stamped
Collect data via RS232 by linking with PC
Up to 1999mV measurement range
Automatic buffer recognition to avoid errors during calibration
Maximum 5 points calibration
Hold record function
Durable electrode holder for left & right side placement
Auto or manual temperature compensation
Auto ranging or manual ranging
Specification :
| pH range | 00.00˷14.00 |
| pH accuracy | +/-0.02 |
| pH resolution | 0.01 |
| mV range | +/-1999mV |
| mV accuracy | +/-0.2mV(-199.9˜199.9mV) or +/-2mV(others) |
| mV resolution | +/-0.1mV(-199.9˜199.9mV) or +/-1mV(others) |
| Temp. range | 0˜80.0°c |
| Temp. accuracy | +/-0.5°c |
| Temp. resolution | 0.1 |
| Compatible probe | PH ,ORP |
| LCD size (mm) | 40(H)x105(W) |
| Operating temp. & RH% | 0˜50°c, Humidity<80% |
| Storage temp. &RH% | -20˜60°c. Humidity <90% |
| Dimension (mm) | 260(L)x168(W)x58(H) |
| Weight | 150g |
| Power | 9V adaptor |
Reliable, Everyday pH Testing with the General Purpose pH Meter ST 551
Meet the demands of routine laboratory, educational, and industrial applications with the General Purpose pH Meter ST 551—a dependable, easy-to-use benchtop pH meter engineered for consistent accuracy, simple operation, and long-term value. Ideal for schools, water treatment facilities, food processing, aquaculture, and QC labs, the ST 551 delivers stable pH measurements from 0.00 to 14.00 pH with ±0.01 pH accuracy, ensuring confidence in every reading without unnecessary complexity.
Engineered for Simplicity, Stability, and Daily Use
The ST 551 General Purpose pH Meter features a clear LCD display, automatic calibration (1–3 points), and Automatic Temperature Compensation (ATC) via a built-in sensor, ensuring accurate results across varying sample temperatures (0–100°C). Its robust design includes a stable base, integrated electrode holder, and durable housing—perfect for high-traffic labs or training environments.
- Accuracy: ±0.01 pH | Resolution: 0.01 pH – Sufficient for most routine testing and compliance needs.
- Automatic Calibration – Recognizes standard buffers (pH 4.01, 7.00, 10.01) for quick, error-free setup.
- ATC with Built-in Temperature Sensor – Compensates readings to 25°C for standardized reporting.
- Benchtop Design with Electrode Stand – Keeps probe secure and organized during use.
- AC-Powered with Battery Backup Option – Stable operation with uninterrupted performance during power fluctuations.
- CE & RoHS Certified – Complies with international safety and environmental standards.
Trusted for Education, Water Testing, and Routine QC
Whether students are learning acid-base chemistry, technicians are checking pool water, or food inspectors are verifying product safety, the ST 551 provides straightforward, trustworthy pH analysis. Its low maintenance, intuitive controls, and consistent performance make it an excellent choice for labs that prioritize reliability over advanced features.
From classroom demos to daily process checks, the General Purpose pH Meter ST 551 delivers essential pH functionality—accurately, affordably, and effortlessly.
Simple. Stable. Ready for every day.
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