How about sales of rugged tablet with barcode scanner under BATL?

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What is the purpose of the diesel vehicle filter, how much impurities can be filtered? But I dare not use the mesh. The maximum mesh is 500 or the theoretical value. it is at least a dozen microns, usually 10 microns or 5 microns,

How to put ceramic rings on the aquarium [fish tank? Not at the bottom,But not great,Ceramic rings are used to raise bacteria,Nitrobacteria like oxygen,Best placed on the water meter layer.Better add a pile of filter cotton in front of the ceramic ring,Can effectively prevent the ring from getting dirty,The ring is hard to clean,It is better to clean the filter cotton.Changing water through diligence will lead to the loss of nitrobacteria,Suction is a must,But the bacteria should be supplemented.Efficient in small filters.Quick action-Whether it's fresh water or sea water aquarium,Best water quality.Keep fish and plants healthy.Reduce the frequency of water change.Long service life.Does not break down itself,Resistant to seawater corrosion.Available in most filters.Not at the bottom,But not great,Ceramic rings are used to raise bacteria,Nitrobacteria like oxygen,Best placed on the water meter layer.Better add a pile of filter cotton in front of the ceramic ring,Can effectively prevent the ring fro