Pen DO Meter

Hangzhou Qiwei Instrument Co., Ltd. is one of the leading manufacturers and suppliers of pen do meter in China. With a professional production team, we are able to meet the needs of the majority of our customers. Welcome to wholesale bulk pen do meter in stock here from our factory. We also accept customized orders.

 

 

 

QW-Lab Pen DO Meter is a compact pocket-size dissolved oxygen meter designed for fast field testing, aquaculture water monitoring, and portable water quality analysis.

 

With lightweight handheld design, one-key calibration operation, replaceable DO sensor components, and waterproof protection, this portable dissolved oxygen meter provides convenient oxygen measurement anytime and anywhere.

 

Unlike traditional benchtop dissolved oxygen meters, the pen DO meter is optimized for mobile testing environments where users require quick measurement, easy operation, and reliable field performance.

 

Recommended applications:

• Aquaculture pond oxygen monitoring

• Fish farming water quality inspection

• Aquarium oxygen testing

• Environmental field measurement

• Outdoor water sampling

• Laboratory mobile testing

Key advantages:

✓ Pocket-size portable design

✓ One-key calibration operation

✓ Fast field measurement

✓ Replaceable electrode membrane system

✓ Long battery operation

 

 

 

 

product key technologies

01.

This Pen DO Meter is specially designed to meet the demands of rapid on-site detection. Featuring a pen-type structure, it allows users to move flexibly between different working sites. The instrument consists of two core components: a sensing and detection module, and an electronic signal processing module.

The sensing unit adopts a membrane-covered dissolved oxygen probe based on the polarographic principle. With an oxygen permeable membrane, the probe delivers a fast response and ensures reliable measurement accuracy. The electronic processing unit adopts a highly integrated circuit system, which is compact in size and ultra-low in power consumption, supporting long-duration field operation.

02.

In terms of human-machine interaction, the device is equipped with a dot-matrix LCD panel with backlight function. Operators can easily read all measurement data even at sampling points during nighttime or in dim environments. The optimized screen layout simultaneously displays dissolved oxygen concentration and real-time temperature readings, greatly improving on-site working efficiency.

Beyond basic measurement functions, the pen DO meter is fully optimized for ease of use. Its pen-shaped design fits easily into pockets, tool bags or life jacket compartments. It is particularly suitable for aquaculture patrol inspection, surface water environmental assessment, quick screening of industrial discharge outlets, sewage treatment process monitoring, and serving as a compact backup measuring solution for laboratory use.

1. Automatic calibration for temperature changes with sensitive and rapid induction.
2. Handheld design for effortless mobile operation on site.
3. Standard accessory: Self-made polarographic membrane-type dissolved oxygen probe.

Designed for wet and demanding measurement environments, the QW-Lab Pen DO Meter features IP67 waterproof protection.

The waterproof housing helps protect the instrument from:

• Dust exposure  • Water splash  • Accidental immersion during field testing

IP67 protection makes the meter suitable for:

• Fish ponds  • Aquaculture farms  • Rivers and lakes  • Water treatment inspection sites

Users can perform dissolved oxygen measurements confidently in outdoor environments without carrying bulky laboratory equipment.

To ensure long-term measurement accuracy, the QW-Lab Pen DO Meter adopts a replaceable dissolved oxygen electrode maintenance design.

Users can replace the membrane cap and maintain the sensor easily without replacing the complete instrument.

DO Sensor Maintenance Steps

Step 1: Remove the Old Membrane Cap

Carefully remove the used membrane cap from the DO electrode.

Step 2: Clean the Electrode

Rinse the electrode surface with clean water and remove any contamination.

Step 3: Install New Electrolyte and Membrane Cap

Fill the new membrane cap with electrolyte solution and install it onto the electrode.

Step 4: Perform Calibration

After sensor replacement, complete one-key calibration before measurement.

Maintenance Benefits：

✓ Extends sensor service life

✓ Reduces operating cost

✓ Simplifies field maintenance

✓ Maintains measurement stability

Aquaculture Oxygen Monitoring

Maintaining proper dissolved oxygen levels is critical for aquatic animal growth and survival.

The Pen DO Meter helps farmers:

• Check oxygen levels quickly

• Identify oxygen shortage risks

• Improve aeration management

• Reduce fish farming losses

Field Water Quality Inspection

Environmental and water quality professionals can use the portable DO meter for:

• Surface water testing

• Outdoor sampling

• Rapid measurement tasks

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