The pHS-25 is an entry-level benchtop pH meter with LCD display and ±0.02 pH accuracy. Features 1–3 point auto-calibration with standard buffer recognition, manual temperature compensation and exceed-limit alarm. A cost-effective option for basic laboratory, educational and general-purpose pH measurement.
The pHS-25 benchtop pH meter is a dependable, economical instrument for basic pH and mV measurement in laboratory, educational and industrial quality control environments. Sharing the same form factor and LCD+LED display as the pHS-2C, the pHS-25 is positioned as the most accessible entry point in the Skill Scientific benchtop pH meter range — offering the core measurement functions needed for routine daily use at a practical price point.
With ±0.02 pH accuracy and a standard 0 to 14.00 pH measurement range, the pHS-25 is well suited to applications where high precision is not a requirement: teaching laboratories, basic water quality checks, general chemical analysis and industrial QC screening. Push-button 1 to 3 point calibration with automatic recognition of pH 4.00, 6.86 and 9.18 standard buffers keeps daily setup time to a minimum.
The pHS-25 includes manual temperature compensation (0–60°C), an exceed-limit alarm for out-of-range alerts, electrode condition monitoring and a self-contained electrode holder — providing the essential tools for reliable routine measurement without unnecessary complexity.
| Model | pHS-25 | |
| Measuring Range | pH | 0 ~ 14.00 pH |
| mV | -1400 ~ +1400 mV | |
| Temperature | — | |
| Resolution | pH | 0.01 pH |
| mV | 1 mV | |
| Temperature | — | |
| Basic Error | pH | ±0.02 pH |
| mV | ±0.5 %FS | |
| Temperature | — | |
| Stability | (±0.05 pH ± 1 digit) / 3h | |
| Included Electrode | E-331D | |
| Electrode Connector | BNC / Binding post | |
| Display | LCD + LED backlight | |
| Electrode Holder | Included | |
| Temperature Compensation | Manual (0–60) °C | |
| Calibration | 1–3 point | |
| pH Buffer | Auto-ID: pH 4.00 / 6.86 / 9.18 / User-defined | |
| Data Storage | — | |
| Connectivity | — | |
| Printing | — | |
| Prompt Tone | Yes | |
| Power Supply | DC 12V | |
| Operating Temperature | 5°C ~ 40°C | |
| Relative Humidity | ≤80% | |
| Dimensions (mm) | Approx. 260 × 210 × 80 mm | |
| Weight (kg) | 1 | |
The pHS-25 and pHS-2C share the same form factor, display type and feature set. The key difference is accuracy: the pHS-2C offers ±0.01 pH accuracy and better stability (±0.02 pH/3h), while the pHS-25 provides ±0.02 pH accuracy with stability of ±0.05 pH/3h. For applications where the highest available accuracy in the LCD range is required — such as more demanding QC testing or environmental monitoring — choose the pHS-2C. For basic educational use, general screening or applications where ±0.02 pH is sufficient, the pHS-25 is a cost-effective alternative.
The pHS-25 provides ±0.02 pH accuracy, which meets the requirements for many routine laboratory applications including general chemical analysis, basic water quality testing, educational demonstrations and industrial screening. For applications requiring tighter accuracy — such as pharmaceutical QC, precise buffer preparation or regulatory compliance testing — consider the pHS-2C (±0.01 pH) or the touchscreen series (pHS-3C, pHS-3, pHS-4, pHS-5) for higher precision.
No. The pHS-25 uses manual temperature compensation with a range of 0–60°C. Enter the sample temperature manually before measurement to ensure accurate pH readings. For samples at variable or elevated temperatures, or where automatic compensation is needed, the pHS-3CT — which includes ATC from -5.0°C to 110.0°C — is recommended.
The pHS-25 supports 1 to 3 point calibration. It automatically recognises standard buffer solutions at pH 4.00, 6.86 and 9.18, and also accepts user-defined buffer values. For routine daily use, a 2-point calibration using pH 4.00 and 6.86 or pH 6.86 and 9.18 buffers is sufficient for most applications.
Yes. In mV mode, the pHS-25 measures electrode potential from -1400 to +1400 mV. Connect a compatible ORP electrode via the BNC input to measure oxidation-reduction potential directly.
The pHS-25 is well suited to university and college teaching laboratories, basic water quality monitoring, food and beverage routine checks, agricultural soil testing and general industrial QC screening where ±0.02 pH accuracy is sufficient and data logging or connectivity are not required.
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