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This is a professional line of meteorological sensors manufactured by Hunan Rika Electronic Tech .

The term is also a widely used model number for industrial and consumer hardware. If you are looking for reviews on these specific items: Rika Sensor RK400 Series rk400.com

: An economical plastic version designed for agriculture and forestry. This is a professional line of meteorological sensors

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: A tipping bucket rainfall sensor used in weather and hydrometric stations.