pH/mV & Electrochemical Meters
Our products are based on electrochemical principles and can quickly measure the pH, electrical conductivity (EC), oxidation–reduction potential (ORP), dissolved oxygen (DO), and specific ions (such as Na⁺, NO₃⁻, and Cl₂) in liquids.
First, choose a suitable meter according to the parameters you need to measure. Is a pH/mV meter sufficient? Do you need to analyze specific ions?
Next, select electrodes that are compatible with the meter.
In addition, we offer other optical instruments for water quality testing, which enable more comprehensive water quality analysis.
If you still feel uncertain after reading this article, please contact us.
Working Principle
Potentiometry
Conductometry
| Parameter | Potentiometry | Conductometry |
| pH | ✔ | × |
| ORP | ✔ | × |
| Ions (Na⁺, NO₃⁻, Cl⁻, etc., ISE) | ✔ | × |
| Conductivity (EC) | × | ✔ |
| Dissolved Oxygen (DO, polarographic) | × | ✔ |
The reference electrode is a core concept in potentiometric analysis. In an electrochemical cell, we cannot directly measure the absolute potential of a single electrode. We can only measure the potential difference (voltage) between two electrodes.
Therefore, a reference electrode with a stable and constant potential must be used as the baseline. Only by comparing the other electrode’s potential against this stable reference can its potential changes be measured accurately.
Pocket pH Meters
Portable instruments for measuring the pH of aqueous solutions or other liquids.
pH/mV Meters
Include both pH mode and mV mode. In pH mode, the meter performs internal calculations and directly displays the pH value. In mV mode, the instrument performs no conversion and directly displays the raw electrode potential in millivolts (mV).
Multiparameter Water Quality Meters
Capable of measuring eight parameters: pH, ORP, DO, conductivity (EC), TDS, salinity, resistivity, and temperature.
Conductivity Meters
Measure conductivity (EC), TDS, salinity, and resistivity.
Potentiostats
Use a three-electrode system with adjustable voltage and current.
| Type | Pen-type pH Meter | pH/mV Meter | pH/mV Meter | Multiparameter Water Quality Meter | Conductivity Meter | Conductivity Meter | Conductivity Meter | Potentiostat |
| Models | PT-P300 | PHB-5 (Portable) | PHS-3D / PTE920 | PT-N300 (Pen-type) | PDB-305 (Portable) | PDS-307 | ||
| Interface Type | Built-in electrode | BNC | BNC | 8-pin connector | Built-in electrode | BNC | BNC | – |
| Composite Electrode | × | √ | √ | pH/ORP | × | × | × | × |
| Separate Electrodes | × | × | √ | Temp./DO/EC | √ | √ | √ | Special electrodes |
pH Electrode (Composite Electrode)
Combines a pH sensing electrode, a reference electrode, and a temperature probe.
ORP Electrode (Composite Electrode)
Combines an ORP sensing electrode and a reference electrode.
Ion-Selective Electrode (Separate Electrode)
Does not include a built-in reference electrode; an external reference electrode is required for proper operation.
Based on conductivity measurements, values such as TDS, salinity, and resistivity can be derived.
Does not require a reference electrode. Includes DO and temperature sensors.
Can be used with pH/mV meters.
Composite electrodes： acid–base titrations； separate electrodes ：precipitation titrations and redox titrations.
