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By certification 
Product description
MS5-2 is a magnetic stirrer customized for liquid mixing, suitable for chemical analysis, biology reagent mixing, regular laboratory experiments and liquid handling.
Feature
Durable brushless motor.
Strong magnetic prevents from stirrer stopping work.
Big stirring volume to 2 L.
Wide range of speed range from 200-1800 RPM.
http://www.nokesci.com/
