Note about cookies



This site uses cookies to provide you with a better user experience. Our website uses cookies, which could include also third party cookies. For more information please visit our Privacy and Cookie Policy page. By continuing to use the site or closing this banner, you are agreeing to our terms of use.

Toggle menu

AZ Instrument Corp.

8401 AZ Handheld DO Meter Dissolved Oxygen Tester | AZ Instrument Corp.

AZ Instrument Corp. strives to research and develop quality, energy-efficient D.O. to benefit the consumers. We can manufacture Dissolved Oxygen Meter, Handheld DO Meter, Portable Dissolved Oxygen Tester that meet specific requirements. Our first responsibility is to completely satisfy the needs of the people and organizations that use and distribute our products while providing the best value solutions for their Dissolved Oxygen Meter requirements. Customer service is another commitment we take seriously, our proven reputation and record of quality support won't leave you stranded.
Categories > Water Quality Tester > Handheld > D.O.
AZ 8401 handheld dissolved oxygen meter with digital display and probe for precise water quality testing.

8401 AZ

Dissolved Oxygen Meter

I'm interested
The AZ 8401 DO meter with its real-time data output port and probe connection.
Secure probe connection port on the AZ 8401 DO meter, ensuring stable signal transmission for accurate dissolved oxygen measurements.
Rear view of AZ 8401 showing the battery compartment and built-in tripod hole for stable, hands-free long-term water quality monitoring.
Welcome to check the Features, Application, Specification, YouTube of 8401 Handheld Digital Dissolved Oxygen Meter as follows
Features :

The AZ 8401 Dissolved Oxygen Meter is developed under high-quality manufacturing processes to ensure reliability and safety:
ISO 9001 Facility: Manufactured in an ISO 9001 certified environment.
CE EN 61326-1 & IEC 61000: Designed and tested to meet European EMC safety standards.
RoHS & REACH Compliant: We provide a Manufacturer’s Self Declaration, ensuring the product meets environmental safety standards for hazardous substances.

8401 AZ Portable Dissolved Oxygen Device features:
* Big LCD with D.O. & Temperature value display and stability indicator
* Easy 100% Dissolved Oxygen Value calibration
* Offered with most cost effective Clark type electrode
* No need refill electrolyte often as galvanic electrode
* Accurate dissolved oxygen measurement
* USB interface for PC linkage

Application :

Application of 8401 AZ Dissolved Oxygen Detector:
The portable 8401 AZ DO meter can measure the value of Dissolved Oxygen with unit of % or ppm or mg/l in liquid, which had been widely operation in the Water Quality Testing applications. It has the big LCD which can display the D.O. (Dissolved Oxygen) value and the temperature.

The 8401 AZ Digital DO Device can calibrate easily in the ventilation environment, welcome to refer the DO calibration procedure video from the following YouTube link.

The 8401 AZ Dissolved Oxygen Meter could link to PC via USB cable to capture the on-line data, and display the Dissolved Oxygen readings with real-time output. User can retrieve file, save the data for operating data analysis, record statistics....versatile functions according different purposes.

The 8401 AZ Digital DO Device could be the best Water Quality tester for all professional measuring purposes, including the LAB, water treatment business, Aquaculture, Aqua farm, swimming pool or other related industry.

The 8401 AZ Dissolved Oxygen Detector was being designed and manufactured by AZ Instrument, a well experienced manufacturer for Environmental Measuring Instrument.

Specification :

Specification of 8401 AZ Dissolved Oxygen Meter:

Model 8401
DO Measuring Range 0~199.9  (in %)
DO Accuracy ±1.5% F.S  (in %)
DO Resolution 0.1%  (in %)
DO Measuring Range 0~19.99 (in ppm or mg/l)
DO Accuracy ±1.5% F.S (in ppm or mg/l)
DO Resolution 0.01 (in ppm or mg/l)
Temperature Measuring Range 0~50.0℃
Temperature Accuracy ±0.3℃
Temperature Resolution 0.1℃
Coefficient of membrane Adjustable
Memory N/A
IrDA Port N/A
Real Time/Recall N/A
LCD Size 44(L)*26 (W) mm
Operating Temperature 0~50℃
Operating RH% Humidity ＜80%
Storage Temperature 0~60℃
Storage RH% Humidity ＜90%
Sensor Life Time >6 months (with good maintenance)
Meter Size 175(L) * 70(W) * 33(H) mm
Weight ~150g
Battery AAA *4 PCS
Standard Package Meter, Batteries, Dissolve Oxygen (D.O.) Probe (840PAZ),
Manual, Carry Case, Electrolyte, Syringe, Membrane, O-ring
Optional Accessory USB Cable & Software

Youtube :

Welcome to learn more about the 8401 AZ Dissolved Oxygen Meter Calibration Procedure from the following YouTube video.


8401 AZ Dissolved Oxygen Meter DO Probe Maintenance Procedure Video

AZ 8401 DO Meter Unboxing Video

FAQ :

【FAQ of AZ 8401 Handheld Dissolved Oxygen Meter with D.O. electrode】


Q1: How often should I calibrate the AZ 8401?
A: For optimal accuracy, calibrate before each use or daily. You should also recalibrate after replacing the membrane or when there are significant changes in temperature or altitude.

Q2: When should I replace the DO probe membrane and electrolyte?
A: Replace them if you notice unstable readings, slow response, or difficulty calibrating. Regular maintenance is recommended every 3–6 months, or immediately if the membrane is torn, fouled, or dry.

Q3: Can I use the AZ 8401 for BOD testing?
A: Yes. But please notice that while the AZ 8401 provides high-accuracy DO readings, it does not have a built-in BOD calculation mode. Users must design their own testing protocol to manually calculate the BOD value based on the results.

Send Message
Contact Information
Verification Code Change Image

By submitting your contact information, you acknowledge that you consent to our processing data in accordance with the Privacy and Cookie Policy.

As one of the most reliable supplier in Taiwan, we supply Dissolved Oxygen Meter with the finest quality. We are the global leader in electrical supplies. We develop, manufacture and distribute groundbreaking Dissolved Oxygen Meter that shatter the status quo and help customers gain and maintain a competitive edge. After knowing the above information, if you want to know more, please come to us. We will provide the information you need and offer high quality Dissolved Oxygen Meter to you at the best price.