Benchtop pH Meters
Benchtop pH meters are designed to measure the pH level of a sample to a high degree of accuracy. They are equipped with multiple features such as large screens, electrode arms and sensors. Apart from acidity and alkalinity, conductivity or dissolved oxygen concentration can also be measured.
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FAQ
A benchtop pH meter offers higher measurement accuracy, stability, and feature integration compared to portable instruments.
Typical laboratory-grade models achieve ±0.001 pH resolution and incorporate automatic temperature compensation (ATC), multi-point calibration, and data logging capabilities.
They are designed for controlled environments such as analytical or QC labs, where precision, traceability, and compliance outweigh mobility.
Handheld meters, while convenient, typically provide lower accuracy (±0.01 pH) and fewer calibration options, making benchtop units the standard for regulated or high-precision applications.
pH readings are inherently temperature-dependent, since electrode potential varies with the Nernst equation slope (~59.16 mV/pH unit at 25 °C).
Benchtop meters implement Automatic Temperature Compensation (ATC) by reading temperature via an integrated or external probe and adjusting the measurement accordingly.
Without ATC, measurements can deviate significantly—especially in high-precision titrations or when comparing samples at different temperatures.
Advanced meters allow manual input of sample temperature or real-time compensation curves, ensuring consistent results across varying thermal conditions.
Accurate pH measurement depends on proper multi-point calibration using traceable buffer standards (commonly pH 4.01, 7.00, and 10.01).
Benchtop instruments typically support 2–5 point calibration, automatically recognizing buffer values and applying slope and offset corrections.
For regulated laboratories, calibration data should be logged, time-stamped, and linked to operator IDs to satisfy GLP/GMP or ISO 17025 documentation standards.
Regular electrode maintenance (hydration, cleaning, and storage in proper solution) further ensures consistent response and extends electrode lifespan.
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