Portable Optical Do Meter

LH-D9 portable optical do meter mainly for the convenience of the user to carry to the site operation. Optical do meter can be divided into the sensor and the electronic unit two parts. The sensor adopts the polarographic coated type dissolved oxygen electrode. Electronic unit for high integrated circuit. Optical do meter USES dot matrix LCD display, can display values of dissolved oxygen and temperature.
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Product Details



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.



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


In the Measurement Mode  

1.Turn on the meter or return to the Measurement Mode.

2.Select % Mode and Place the probe at 1cm above the liquid until READY shows.(Get high accuracy ,please keep the probe for 1min or longer .)

3.Press MODE a few times until the Calibrating is flashing on the Second Display, press HOLD/SET to enter Calibration Mode. (Calibrating stop flashing)

4.The meter will automatically recognize the standard solution and automatic calibration. During this process, calibration value will be shown on the Second Display.

5.After Calibration, meter automatically returns to Measurement Mode.

At most 2 points calibration: 0% and 100%, when the solution cannot be recognized, show “Err” for 2s. Then automatically returns to Measurement Mode.

NOTE: For 100% calibration, air calibration way is a simple, quick, approximate method.

(For high accuracy, we recommend that users should regularly calibrate. In the following situation, users must recalibrate meters.)

About 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 (%).

About us

Multi-parameter water quality analyzer series

Outdoor multiple in one meter

COD reactor

Multi-parameter portable water quality detector

Water sample heating thermostat

Fluorescent dissolved oxygen electrode

Pen type salinometer

Residual chlorine electrode

Portable water quality analyzer

DO dissolved oxygen meter

Digital refractometer

Rapid detection series

Color comparison tube series

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.


Q1: Why choose us?
A: 1. We have our own factory with strong R&D center and QA team which can make sure your goods can be sent out on time and in superior quality. 
2. We have experienced and dedicated core members to offer you professional and reliable before-sales and after-sales service.
3. We have purveyed customers with the lowest wholesale price.

Q2: How do you guarantee the quality?
A: One year's guarantee from date on B/L. Normally. If it's quality problem, we promise to return goods or funds.

Q3: Is OEM available?
A: Yes, all goods can be custom made by your requirements, including packing, LOGO print, etc.

Q4: Can we buy 1 pc for sample testing?
A: Yes, we are glad to send 1pc for quality testing if we have stock of the model you required.

Q5: How to deliver the goods for trial order or small order?
A : For small order, we prefer to choose international express, such as DHL, TNT, EMS which are faster and more convenient for customer. Also, we cooperate with an express agent that can give us a big discount for express fee which is much lower than that quoted by official. For the goods with detachable battery, the express fee can be lower down if the goods is sent out without battery.

Q6: What kind of payment your company accept?

Q7: If we have not found the model from website, what should we do?
A: Please email us with description and picture of the product, we research and develop new model every month, and some of them maybe have not been uploaded in website immediately. But If this is a new products for us, we can develop it for you after get all detailed information about your product.

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