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Rika Sensors device to test water quality In an effort to provide a high quality device to test water quality, Hunan Rika Electronic Tech Co.,Ltd has made some efforts to improve the whole production process. We have built lean and integrated processes to maximize the production of the product. We have designed our unique in-house production and traceability systems to meet our production needs and thus we can track the product from beginning to end. We always ensure the consistency of the whole production process.solar radiation meters & pyranometers,solar radiation management,solar radiation basics.