Qiwei PH-220W External Electrode vs Ordinary Pen pH Meter Malaysia

A portable pH meter is commonly used for checking water in aquaculture, cooling towers, wastewater treatment, laboratories and industrial processes. However, not every pH tester is suitable for the same measuring location.

The Qiwei PH-220W Portable pH Meter uses an external wired electrode, while an ordinary pen-type pH meter normally has its electrode built directly into the instrument.

Understanding this difference can help Malaysian users choose a more suitable pH meter for their actual application.

What Is an Ordinary Pen-Type pH Meter?

An ordinary pen pH meter combines the display, electronics and electrode in one compact body.

To take a measurement, the sensor end of the complete instrument must be inserted into the water sample.

This design is convenient for:

Cups and beakers

Small water containers

Aquarium testing

Drinking-water checks

Simple field measurements

Quick spot checks

A normal pH pen is compact and easy to carry. However, it may be inconvenient when the water is located inside a deep tank, narrow container or restricted sampling point.

What Is Different About the Qiwei PH-220W?

The Qiwei PH-220W uses an external pH electrode connected to the main instrument by a cable.

Only the electrode needs to be placed into the sample. The operator can continue holding the display away from the water.

This configuration is more suitable for:

Aquaculture ponds

Fish tanks

Cooling towers

Boiler-water samples

Wastewater tanks

Electroplating solutions

Agricultural nutrient tanks

Industrial process water

Laboratory sample containers

Qiwei PH-220W vs Ordinary Pen pH Meter

Electrode Configuration

Qiwei PH-220W: External wired electrode

Ordinary pH Pen: Built-in electrode

The external electrode is easier to place inside a deep tank or difficult-to-reach container.

Instrument Handling

With an ordinary pH pen, part of the complete instrument must be held close to or inserted into the sample.

With the PH-220W, the operator can hold the display separately while lowering the electrode into the water.

Measuring Deep Containers

An ordinary pH pen may not reach the required measuring depth safely.

The PH-220W provides better flexibility for tanks, ponds and containers because its electrode is separated from the display.

Electrode Maintenance

Both types require correct cleaning, calibration and storage.

The PH-220W’s external electrode is easier to inspect separately. Customers should confirm electrode replacement availability before purchasing any external-electrode pH meter.

Portability

An ordinary pH pen is generally smaller and simpler to carry.

The PH-220W remains portable but includes an external electrode and cable. It is better suited to users who prioritise measuring flexibility over minimum size.

When Should You Choose the Qiwei PH-220W?

Choose the Qiwei PH-220W when:

The water is inside a tank or pond

The measuring location is difficult to reach

You do not want to place the complete instrument near the water

An external wired probe is more convenient

You require 0.01 pH resolution

Both pH and temperature readings are needed

The instrument will be used for routine industrial or aquaculture monitoring

When Is an Ordinary pH Pen Enough?

A normal pen-type pH tester may be sufficient when:

Testing small samples in cups or beakers

Only occasional pH checks are required

The lowest purchase price is the main consideration

The sample location is easy to access

High measuring flexibility is not required

For basic household or aquarium testing, a standard pH pen may be adequate. For tanks, ponds and industrial applications, the external electrode of the PH-220W may be more practical.

Main PH-220W Specifications

pH Measuring Range: 0.01 to 14.00 pH

pH Resolution: 0.01 pH

Temperature Range: 0 to 50°C

Temperature Resolution: 0.1°C

Calibration: Three-point pH calibration

Electrode: External wired pH electrode

Power Supply: Four 1.5V batteries

Weight: Approximately 88g

Specifications and supplied accessories may vary according to the latest production batch. Please confirm the current configuration before ordering.

Important Electrode-Care Advice

The condition of the electrode directly affects pH response and reading stability.

For better performance:

Rinse the electrode before and after use

Use fresh buffer solutions for calibration

Avoid touching the glass sensing area

Do not allow the electrode to remain dry

Use the correct pH-electrode storage solution

Do not continuously store the electrode in distilled water

Clean the electrode after testing dirty or chemical samples

An unstable reading does not always mean that the instrument is faulty. A dry, contaminated or ageing electrode is a common cause of slow and inconsistent pH readings.

Which One Should Malaysian Users Buy?

For small containers and simple testing, an ordinary pH pen remains a practical and economical choice.

For aquaculture ponds, water-treatment tanks, cooling towers, wastewater and industrial applications, the Qiwei PH-220W external-electrode design offers better measuring flexibility.

The most suitable choice depends on the sampling point, required resolution and frequency of use.

Qiwei PH-220W Available in Malaysia

The Qiwei PH-220W External Electrode Portable pH Meter is available from stock at MTM Precision Malaysia.

Customers may contact our team for product selection, current stock, quotation, supplied accessories and electrode information.

Contact MTM Precision

MTM Precision Sdn. Bhd. (744811-A)

Telephone: +603-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com / enquiry@mtmpre.com.my

Website: www.mtmpre.com.my

Showroom & Service Centre

No. 29-1 & 29-2, Jalan Bandar 18,