Demonstration of telephone principle

Demonstration of telephone principle   It can be used to illustrate the basic working principle of telephone.   Design


OEM / ODM



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Beijing Weichengya Laboratory Equipment Co.,Ltd is the leading solution supplier for data logger,digital sensors and tradtional laboratory equipment .

We concentrate on data logger and digital sensors for nine years .and there are three series data logger , more than 40 sensors and more than 60 laboratory instrument ,which is working together with sensors to do experiment .

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