Portable Dissolved Oxygen Meter for Fish Farms in Johor Qiwei JPB-70A Malaysia
Portable Dissolved Oxygen Meter for Fish Farms in Johor Qiwei JPB-70A Malaysia
Fish farms and aquaculture operators in Johor must manage dissolved oxygen carefully, especially during hot weather, extended cloudy conditions, heavy rain and periods of increased feeding.
The Qiwei JPB-70A Portable Dissolved Oxygen Meter provides an economical solution for routine oxygen checks in freshwater fish ponds, shrimp farms, hatcheries and aquaculture tanks.
Instead of relying only on fish behaviour, operators can measure the actual dissolved oxygen concentration in mg/L and take corrective action when necessary.
Why Johor Fish Farms Need DO Monitoring
Dissolved oxygen levels can change throughout the day due to:
High water temperature
Fish stocking density
Feeding rate
Algae concentration
Organic waste
Rainfall
Cloud cover
Water circulation
Aerator performance
Pond depth
A pond may show a healthy oxygen reading in the afternoon but experience a significant drop before sunrise. Regular measurements provide a clearer picture of daily pond conditions.
Common Signs of Insufficient Oxygen
Fish-farm operators should investigate when they notice:
Fish gasping near the surface
Fish gathering around aerators
Fish concentrating near water inlets
Reduced feeding activity
Slow or unusual swimming behaviour
Shrimp moving toward shallow areas
Sudden mortality during early morning
Unpleasant odour from pond water
Poor water circulation
These signs may indicate low dissolved oxygen, but they can also be related to other water-quality problems. A DO meter helps confirm whether oxygen is a contributing factor.
Qiwei JPB-70A Main Features
Dissolved oxygen range: 0.019.9 mg/L
Resolution: 0.1 mg/L
Basic DO accuracy: approximately ±0.3 mg/L
Temperature range: 040°C
Automatic temperature compensation
Polarographic membrane-type DO electrode
Portable handheld display
Suitable for routine on-site measurements
Displays dissolved oxygen and temperature
The 0.1 mg/L resolution is practical for routine pond management and general aquaculture checks.
Recommended Measurement Times
Before Sunrise
This is often the most critical measurement because algae and aquatic organisms consume oxygen throughout the night.
During Feeding
Low oxygen may affect feeding activity. Check the pond when fish are not responding normally.
Late Afternoon
The afternoon reading helps operators observe oxygen produced during daylight hours.
After Heavy Rain
Heavy rain can affect temperature, water mixing and pond conditions. Test before making major feeding decisions.
During Extended Cloudy Weather
Reduced sunlight may decrease oxygen production by algae and aquatic plants.
After Changing Aerator Operation
Measure before and after operating the aerator to check whether oxygen distribution improves.
Test Several Pond Locations
A single reading beside the aerator may not represent the whole pond.
Useful testing points include:
Near the water inlet
Near the pond centre
Beside the aerator
Away from the aerator
Near feeding areas
At different depths
Near areas where organic waste accumulates
Record the location, depth and measurement time so that future results can be compared properly.
How to Use the JPB-70A at a Fish Farm
Check the electrode membrane before use.
Switch on the instrument and allow the probe to prepare.
Lower the electrode into the pond.
Move the probe gently to create consistent water flow across the membrane.
Avoid direct contact with mud, pond walls or large air bubbles.
Wait for the reading to stabilise.
Record the DO value and water temperature.
Repeat the test at other locations.
Rinse the electrode with clean water after use.
The polarographic probe requires gentle water movement. Holding it in completely still water may cause the reading to decrease or respond slowly.
What to Do When Dissolved Oxygen Is Low
If the JPB-70A confirms insufficient oxygen:
Start or increase mechanical aeration
Check whether all aerators are operating correctly
Reduce or temporarily stop feeding
Improve water circulation
Investigate excessive algae or organic waste
Check stocking density and biomass
Retest after corrective action
Continue monitoring until readings stabilise
Corrective action should consider the fish species, growth stage, temperature and farm-management system.
JPB-70A versus pH and TDS Testers
A dissolved oxygen meter measures a different water-quality parameter from common test pens.
InstrumentWhat It MeasuresWhy It MattersJPB-70A DO meterDissolved oxygenOxygen available to aquatic organismspH meterAcidity or alkalinityAffects fish health and chemical balanceEC/TDS meterDissolved ionic contentIndicates changes in dissolved substancesTurbidity meterWater cloudinessIndicates suspended particlesAmmonia testerAmmonia concentrationHelps identify toxic nitrogen conditions
For better pond management, DO results should be assessed together with temperature, pH and other relevant water-quality parameters.
Electrode Care in Aquaculture Applications
Fish-pond water may contain algae, suspended solids and biological material that can coat the electrode membrane.
After testing:
Rinse the probe with clean water
Remove soft contamination carefully
Do not scrape the membrane
Inspect for wrinkles or damage
Check for trapped air bubbles
Replace electrolyte and membrane components when required
Store the probe according to the manufacturer’s instructions
Proper electrode maintenance helps improve response time and measurement consistency.
Who Should Use the JPB-70A?
The Qiwei JPB-70A is suitable for:
Freshwater fish farms
Shrimp farms
Aquaculture hatcheries
Koi breeders
Pond-management contractors
Agricultural colleges
Aquaculture consultants
Routine environmental field checks
It is intended for portable spot measurements. Customers requiring continuous monitoring, automatic aerator control or remote alerts should consider an online dissolved oxygen system.
Buy Qiwei JPB-70A in Johor
The Qiwei JPB-70A Portable Dissolved Oxygen Meter is available from MTM Precision in Malaysia.
We can supply customers in Johor Bahru, Pasir Gudang, Kota Tinggi, Pontian, Kluang, Batu Pahat, Muar, Segamat and other areas of Johor.
Contact MTM Precision to confirm stock, price, accessories and suitability for your fish pond or aquaculture application.
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,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Contact MTM Precision for the Qiwei JPB-70A dissolved oxygen meter price and delivery to Johor, Malaysia.
18 Sep 2026
