Laboratory Consumables

Founded in 2008 Hangzhou Lohand Biological Technology Co., Ltd is a national high-tech enterprise focusing on the research, development, production and sales of water quality monitoring products. Relying on the scientific research technology of Zhejiang University, The company has established R & D centers in Jianggan Science Technology Park and West Lake Science Technology Park. Lohand has developed more than 100 innovations in water quality industry including high-precision water quality analysis instruments, Internet of Things online monitoring equipment, electrochemical sensors, rapid diagnostic reagents, and test strips. The product has dozens of national patents.The company is a pioneer in the rapid monitoring industry of domestic water quality.
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Product Details


Laboratory Consumables

Product name

Model No.

Measuring range

Test method

No. of Tests

Shelf life

Free chlorine  test kit


0.05-1 mg/L

DPD method


2 year


1. Simple and easy - using visual colorimetry or titrimetry method, users can complete the test independently without specialized training.
2. Fast and efficient - several minutes is enough to complete the analysis of one water sample. No need any other instrument for test.
3. Accurate and reliable - the test method derives from the international standard, the resuit can be recognized world widely.
4. Smart and portable - small size, light weight.Widely used in food, beverage, scientific, agricultural, environmental, monitor and all other related areas.



How to use colorimetric chart
Fill the tube with testing liquid to a certain level specified in the instructions;
2 Adding reagent
Add one pack of reagent(or two different reagent according to the instructions),then close the lid and sway the tube to make the reagent dissolved thoroughly.
3.Compare the liquid color against the colorimetric chart
A.Lay the colorimetric chart flat under the adequate light
B.Put the tube above the colorimetric chart vertically
C.Compare the color of testing liquid with the color on the colorimetric chart,find out the same color and get the concentation.



Since its establishment, Hangzhou Luheng Biotechnology Co., Ltd. has been aiming to build the first brand in China's water quality testing field, and is eager to contribute to China's environmental protection cause. We pursue the most advanced technology, the best after-sales service, and the most equal cooperation and reciprocity policy. For cooperative merchants, we will establish a reasonable price sales system to ensure profit; responsible for all product after-sales work to save your precious time; through the technical innovation of excellence, to ensure that our product quality is long-term leading products in the market. We sincerely invite interested partners from all industries to join us and create a bright future together.



1、Telephone, network, on-site consultation, oral or text acquisition of company and product information;

2、Get product information by email or email to gain insight into company and product information;

3、Fill out the cooperation registration form to understand the product cooperation policy;

4、The company checks and evaluates cooperation credits;

5、In-depth discussion of cooperation details;

6、Achieve cooperation intentions;

7、Sign a cooperation agreement;

9、Delivery / inspection

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