Modular and extendible hermetic units for the accurate metering by weight of powdered minor ingredients. Automatic metering of minor ingredients through modular and integrated units loaded manually or pneumatically thanks to direct suction of the product from the sack. Manual metering of micro ingredients through table. High precision and reliability with no leftovers within the storing units or the dosing station. No powder leakage thanks to the suction system which acts directly on the unloading from each unit. Fit for challenging products such as milk powder, cocoa powder, salt and others. The elliptical hoppers in the TME model allow ultra fast discharge.