Waterproof pH Tester
Waterproof handheld pH meter with 0.01 pH resolution, ±0.03 pH accuracy, and automatic temperature compensation for portable measurements across the 0.00-14.00 pH range.
| Measuring range | 0.00~14.00pH |
| Model | pH-98107 |
| calibration | 1 or 2 points calibration |
| Working temperature | 0~60°C, RHâ¤95% |
| Auto shut-off | Approx.4minutes |
| Automation Level | manual |
The ConductScience pH-98107 waterproof pH tester provides portable electrochemical pH measurement with 0.01 pH resolution across the full 0.00-14.00 pH range. The instrument utilizes a combination glass electrode with automatic temperature compensation for accurate measurements in laboratory, field, and industrial applications. The waterproof design enables reliable operation in humid environments up to 95% RH at temperatures from 0-60°C.
This handheld meter features 1 or 2-point calibration capability and automatic shut-off after 4 minutes to preserve battery life. The compact 175×41×23mm form factor and 90g weight facilitate portable measurements while maintaining ±0.03 pH accuracy. Four AG13 watch batteries provide extended field operation without requiring external power sources.
How It Works
The pH-98107 operates through potentiometric measurement using a combination glass electrode that contains both pH-sensitive and reference elements. The pH-sensitive glass membrane develops an electrochemical potential proportional to hydrogen ion activity in the sample solution, following the Nernst equation relationship of approximately 59.16 mV per pH unit at 25°C.
The instrument incorporates automatic temperature compensation (ATC) through a built-in temperature sensor that adjusts the pH reading based on the temperature-dependent slope of the electrode response. This compensates for the theoretical 59.16 mV/pH unit slope variation that occurs with temperature changes, ensuring accurate measurements across the 0-60°C operating range.
Digital signal processing converts the millivolt potential to pH units and displays the result on the LCD with 0.01 pH resolution. The waterproof construction protects internal electronics while maintaining electrode contact with the sample solution through a sealed measurement interface.
Features & Benefits
Measuring range
- 0.00~14.00pH
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Microbiology
- Pharmaceutical QC
- Water Quality & Environmental Monitoring
Model
- pH-98107
calibration
- 1 or 2 points calibration
Working temperature
- 0~60°C, RHâ¤95%
Auto shut-off
- Approx.4minutes
Automation Level
- manual
Brand
- ConductScience
Accuracy
- ±0.03pH
Power/Voltage
- 4x1.5V (AG13 Watch battery)
Dimensions
- 175Ã41Ã23mm
Weight
- 90g
Weight
- 0.2 kg
Dimensions
- L: 6.89 mm
- W: 1.61 mm
- H: 0.91 mm
Comparison Guide
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| pH Resolution | 0.01 pH | Entry-level meters often provide 0.1 pH resolution | Higher resolution enables more precise measurements for quantitative analysis and quality control applications. |
| Accuracy Specification | ±0.03 pH | Portable meters commonly offer ±0.1 to ±0.2 pH accuracy | Superior accuracy reduces measurement uncertainty and improves data reliability in critical applications. |
| Operating Temperature Range | 0-60°C with ATC | Basic meters often limited to narrower temperature ranges | Extended range with automatic temperature compensation accommodates diverse sampling conditions without manual corrections. |
| Calibration Options | 1 or 2-point calibration | Some portable meters offer only single-point calibration | Flexible calibration protocols optimize accuracy across specific measurement ranges and sample types. |
| Construction | Waterproof design | Many portable meters lack full waterproof protection | Enables reliable operation in humid field environments and protects against moisture damage. |
| Weight | 90g compact design | Varies by model and feature set | Lightweight construction facilitates extended field use and portable sampling protocols. |
The pH-98107 combines laboratory-grade accuracy with portable field capability, offering 0.01 pH resolution and ±0.03 pH accuracy in a waterproof 90g package. The automatic temperature compensation and flexible calibration options provide measurement reliability across diverse applications.
Practical Tips
Perform 2-point calibration when measuring samples outside pH 5-9 range using buffers that bracket the expected sample pH.
Why: This improves accuracy by correcting for electrode slope variations across the full pH range.
Allow buffer solutions to equilibrate to measurement temperature before calibration, especially in field conditions.
Why: Temperature differences between buffers and samples can introduce calibration errors despite ATC correction.
Store electrode in pH 7.00 buffer solution or proper electrode storage solution, never in distilled water.
Why: Distilled water can leach electrolytes from the reference junction and degrade electrode performance over time.
Clean electrode with appropriate cleaning solutions for protein or organic residues that may affect response time.
Why: Contaminated electrodes show slow response and drift, compromising measurement accuracy and precision.
Rinse electrode thoroughly with distilled water between samples to prevent cross-contamination.
Why: Sample carryover can bias subsequent measurements, particularly when moving between samples with significantly different pH values.
Allow adequate time for reading stabilization, particularly with high ionic strength or buffered samples.
Why: Rushing measurements before equilibrium can result in inaccurate readings and poor reproducibility.
If readings drift or respond slowly, check electrode condition and perform fresh calibration with new buffer solutions.
Why: Electrode aging or contamination manifests as slow response and measurement drift before complete failure.
Record measurement temperature along with pH values for samples measured outside normal laboratory conditions.
Why: Temperature documentation enables post-measurement corrections if needed and improves data traceability.
Setup Guide
What’s in the Box
- pH-98107 waterproof pH meter
- Combination pH electrode (typical)
- Electrode storage solution (typical)
- Calibration buffer solutions pH 4.00, 7.00, 10.00 (typical)
- 4 × AG13 watch batteries
- User manual and calibration certificate (typical)
- Protective carrying case (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support for calibration and measurement troubleshooting.
Compliance
References
Background reading relevant to this product:
What calibration frequency is recommended for maintaining ±0.03 pH accuracy?
Daily calibration with pH 7.00 buffer is recommended for routine use, with 2-point calibration using pH 4.00 and 10.00 buffers weekly or when measuring samples outside the pH 5-9 range.
Can this meter measure samples with high ionic strength or extreme temperatures?
The meter operates from 0-60°C with automatic temperature compensation. High ionic strength samples may require more frequent calibration; consult product datasheet for specific ionic strength limitations.
How does the waterproof rating affect electrode performance and maintenance?
The waterproof construction protects electronics while maintaining standard electrode contact with samples. Normal electrode maintenance including regular cleaning and proper storage remains essential for measurement accuracy.
What is the expected electrode lifetime and replacement procedure?
Electrode lifetime typically ranges from 1-2 years depending on use frequency and sample types. Replacement involves connecting a new combination electrode to the meter's BNC connector.
Does the meter store calibration data or measurement results?
Consult product datasheet for data logging capabilities. The meter retains calibration parameters during normal operation and includes automatic shut-off to preserve battery life.
How does this compare to benchtop pH meters for accuracy and stability?
The ±0.03 pH accuracy is suitable for most field and QC applications. Benchtop meters may offer higher precision for critical analytical work, but this portable design provides comparable accuracy with field portability.
What sample volume is required for accurate measurements?
Sufficient sample volume to fully immerse the electrode tip and reference junction is required, typically 25-50 mL minimum depending on container geometry.
Can the meter be used for continuous monitoring applications?
The 4-minute auto shut-off is designed for intermittent measurements. For continuous monitoring, consult product specifications for external power options or consider dedicated process pH analyzers.
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