Portable Digital Do Meter

Portable DO meter can test the dissolved oxygen in water ,which is used in many fields like aquaculture ,water treatment ,environmenal monitoring ,river regulation and so on.
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Product Details

Portable Digital Do Meter

Portable Digital Do Meter 


New type waterproof water treatment instrument instrument satisfies the demand of most users with high rate between price and performance.There are three types:portable dissolved oxygen (DO) meter LH-D9,portable PH/ORP meter LH-P5,portable conductivity meter LH-C6 with classification of waterproof IP67 and shockproof design.It is suitable for the fields of monitoring under rugged environment and underwater works.

Portable Digital Do Meter 


DO meter



Oxygen (Mg/L)



0 to 199.9






0.1℉ (0.1℃)


±1.5% FS

±1.5% FS


Responding Time





At most 2 points

Temperature Compensation

Auto (ATC) from 32-122℉ or 0-50℃

Operating Temperature





Plastic electrode

Portable Digital Do Meter  


IP67 Waterproof


2*AA Battery    

User friendly   

DO Measurement  

High Accuracy

2 data points for Calibration  

Automatic Temperature Compensation

Rapid Response

Restore Factory Default  


Auto Power-Off 

Portable Digital Do Meter  

Power on

1. Press POWER once to turn the meter on, wait for 5 min (electrode polarization)  

2. Press POWER again to turn the meter off.

 NOTE:  All operations are operational when the meters power on. 

Working mode

MODE,enter into different mode :

1. Enter into measurement mode as soon as power on.  

2. Press MODE once,”%” flash on the Second Display, Saturation mode

3. Press MODE twice,”mg/L” flash on the Second Display, Oxygen content mode

4. Press MODE three times “℃” flash on the Second Display, Degrees Celsius temperature unit mode.

5. Press MODE four times, “℉”flash on the Second Display, Degrees Fahrenheit temperature unit mode.

6. Press MODE five times, “Calibrating” flash on the Second Display,Calibration mode. 

7. Press MODE six times, “R” flash on the Main Display,Restore factory default mode.

8. Press MODE seven times, “P.1” flash on the Main Display,Salinity mode.

9. Press MODE eight times, “P.2” flash on the Main Display,Pressure mode.

 HOLD/SET,when in the Measurement Mode, it acts as HOLD function.

When in the Setting Mode, it acts as Confirmation or Selection function. 

Portable Digital Do Meter 

What is Do?

DO: Oxygen saturation (symbol SO2) is a relative measure of the concentration of oxygen that is dissolved or carried in a given medium as a proportion of the maximal concentration that can be dissolved in that medium. It can be measured with a dissolved oxygen probe such as an oxygen sensor or an optode in liquid media, usually water. The standard unit of oxygen saturation is percent (%).


Portable Digital Do Meter 

About us

Founded in 2008, Hangzhou Lohand Biological Technology Co., Ltd. Is a company that designs, develops, produces and sells water quality rapid test strips, reagents and precision testing instruments. It is located in Jianggan Science and Technology Park and relies on Zhejiang University Food Science and Technology Park and the West lake Science and Technology Park, focusing on technological innovation, has obtained a number of patents and produces provide customers with professional, fast, affordable and simple testing products and services to create a new history of water quality monitoring.

In the course of ten years of development, we have been constantly working hard in this field, and constantly improving product functions, testing accuracy, dedicating to environmental water quality monitoring and rapid monitoring of product development. The products developed and produced mainly include COD, ammonia nitrogen, total phosphorus, total ammonia integrated machine, miniature COD reactor, water quality monitoring electrode, digital refractometer, etc. Most of the company’s products have obtained CE certification; widely used in domestic environmental protection bureaus, industrial enterprises, university research institutes, food manufacturing enterprises; especially electrochemical testing products have been sold at domestic and foreign.

We sincerely welcome domestic and foreign merchants to achieve win-win cooperation, common development and create brilliant!



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