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Belt ingredient formula used for small and medium sized construction site, because of its smaller base materials such as sand PL800 with 500Kg, press = ± 2% error count, error in the absolute value of 0 ~ 20Kg, so as to further improve dosing accuracy and reduce errors value without affecting the efficiency of distribution, it can be low speed ingredients, rapid discharge mode. Error can be controlled within 0 ~ 5Kg it.