High-Precision Digital Dissolved Oxygen Meters (DO Meters) & Analyzers

As a premier ISO-certified B2B manufacturer of electrochemical instruments, Hangzhou Qiwei Instrument Co., Ltd. produces commercial-grade Dissolved Oxygen Meters (DO Meters & Analyzers) engineered for wastewater aeration control, aquaculture management, environmental water monitoring, and industrial boiler feed water evaluation.

Equipped with polarographic or advanced optical luminescence sensors, microcomputer processing circuits, and automatic temperature, barometric pressure, and salinity compensation (ATC/APC/ASC), our DO meters deliver rapid, highly accurate, and maintenance-free oxygen readouts.

Get Bulk Wholesale Quote Download DO Meter Specification

Portable DO Meter
Dissolved Oxygen Measurement Range: (0.00～20.00) mg/L
Temperature Measurement Range: (0～40)°C
Dissolved Oxygen Basic Error: ±0.3mg/L
Temperature Basic Error: ±1°C
Benchtop DO Meter
Model: JPB-605
Measuring Range: (0~19.99) mg/L
Temperature: (0~40) °C
Basic Error: ±0.3 mg/L
Temperature Fluctuation: ±1°C
Pen-Type Dissolved Oxygen Meter
Pen-Type Dissolved Oxygen Meter for Aquaculture and Field Water Testing
Model: JPB-80A
Measuring range: (0 ~ 19.99) mg/L
Temperature: (0 ~ 40) °C
Basic Error: ±0.3 mg/L
Pen DO Meter
Pocket-size Dissolved Oxygen Meter for Aquaculture and Field Water Testing
Model: JPB-70A
Measuring range: (0 ~ 19.9) mg/L
Temperature: (0 ~ 40) °C
Basic Error: ±0.3 mg/L
Portable Dissolved Oxygen Meter
Portable Dissolved Oxygen Meter for Field Water Testing and Aquaculture
Model: JPB-607A
Measuring Range: (0 ~ 19.9) mg/L
Temperature: (0 ~ 40) °C
Basic Error: ±0.3 mg/L
Benchtop Dissolved Oxygen Tester
Benchtop DO Controller & Meter | Precision Dissolved Oxygen Control - Qiwei
Model: JPB-605
Measuring range: (0~19.99) mg/L
Temperature: (0~40) °C
Basic error: ±0.3 mg/L
Benchtop Dissolved Oxygen Meter
Benchtop DO Meter for Aquaculture and Laboratory Research
Model: JPB-650
Measuring range: (0~19.99) mg/L
Temperature: (0~40) °C
Basic error: ±0.3 mg/L
Industrial Online DO Controller
Industrial Online Dissolved Oxygen Controller for Wastewater Treatment and Aquaculture Monitoring Measurement range: 0~20.00 mg/L
Resolution: 0.01 mg/L
Error: ±0.3 mg/L
Power...

Explore Our Dissolved Oxygen Testing Series

Versatile oxygen testing options designed for portable field inspection, precision benchtop analysis, and continuous industrial process control.

1. Laboratory Benchtop DO Meters

High-accuracy benchtop instruments featuring large backlit LCD displays, automatic barometric pressure and salinity correction, and USB data transmission for R&D laboratories.

DO Range: 0.00 to 20.00 mg/L (ppm); 0 to 200% saturation
Automatic Temperature, Pressure & Salinity Compensation
GLP compliant memory for up to 1000 data sets

Inquire Benchtop Models →

2. Portable Field DO Testers

Rugged handheld meters packaged in waterproof field cases with polarographic or optical DO probes for rapid on-site oxygen verification in fish farms, rivers, and wastewater outfalls.

IP65 waterproof housing with rechargeable battery
Fast response membrane or optical cap technology
Built-in barometric pressure sensor for auto-calibration

Get Portable Kit Specs →

3. Online Industrial DO Process Controllers

Continuous 24/7 online dissolved oxygen sensors and industrial transmitters designed for automated aeration tank control in wastewater plants and large aquaculture systems.

4-20mA / RS485 Modbus PLC integration
Relay control output for automated blower/aerator switching
Corrosion-resistant IP68 industrial immersion body

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Critical Industrial Applications & Engineering Strengths

Why Dissolved Oxygen (DO) Monitoring is Vital

Dissolved oxygen measures the amount of gaseous oxygen dissolved in water, serving as the most critical indicator of biological health and oxidation control. Key applications include:

Municipal & Industrial Wastewater Treatment: Optimizing aeration basin oxygen levels to support aerobic bacteria and reduce energy consumption
Aquaculture & Fish Farming: Preventing fish kills by maintaining optimal dissolved oxygen thresholds ($> 5\,mg/L$)
Environmental Water Quality: Assessing self-purification capacity in rivers, lakes, and reservoirs
Boiler Feed Water Systems: Preventing pipe corrosion by monitoring residual oxygen levels

Qiwei Manufacturing & OEM Advantages

Supporting global electrochemical instrument distributors, system integrators, and brand owners:

Polarographic & Optical Sensor Options: Choose traditional polarographic probes or maintenance-free optical luminescence caps
Advanced Compensation Algorithms: Automatic correction for temperature, atmospheric pressure, and salinity
OEM & ODM Customization: Logo branding, custom housing colors, and localized language software UI
Internal Links: Combine with our pH Meters, Electrochemical Instruments, and Spectrophotometers for complete water analysis.

Frequently Asked Questions (DO Meter Sourcing Guide)

Q1: What is the difference between polarographic and optical (luminescence) DO sensors?

Polarographic sensors consume oxygen during measurement and require electrolyte maintenance and membrane replacement. Optical sensors use luminescence quenching principles, do not consume oxygen, require no electrolyte or membrane changes, and offer superior long-term calibration stability with minimal maintenance.

Q2: Why are temperature, pressure, and salinity compensation necessary for DO measurement?

Oxygen solubility in water decreases as water temperature and salinity increase, and changes significantly with barometric pressure altitude variations. Qiwei DO meters incorporate automatic sensors and manual inputs to adjust for ATC, ASC, and APC, ensuring high measurement precision.

Q3: Do you support OEM custom branding and wholesale distributor pricing?

Yes, as a factory-direct manufacturer, we offer complete OEM/ODM custom branding, customized UI interfaces, private label packaging, and tiered volume discounts for global laboratory suppliers.

Require Factory Direct Pricing or Custom Dissolved Oxygen Equipment?

Get in touch with Hangzhou Qiwei Instrument today for technical consultation, probe options, and competitive distributor pricing within 24 hours.

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Hangzhou Qiwei Instrument Co., Ltd. is one of the most reliable manufacturers and suppliers of do meter in China, featured by quality products and good service. Please rest assured to buy bulk durable do meter in stock here from our factory. We also accept customized orders.

Benchtop Dissolved Oxygen Meter, Benchtop DO Meter, Pen DO Meter