Pronunciation varies by accent · noun
A mechanical device consisting of a metal box with a series of vertical slats through which material is poured and randomly divided into two samples; this process is repeated to obtain a small representative sample of a bulk material..
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Riffler means A mechanical device consisting of a metal box with a series of vertical slats through which material is poured and randomly divided into two samples; this process is repeated to obtain a small representative sample of a bulk material..
Common synonyms include riffle sampler, riffle splitter.
The opposite depends on the specific sense.
Use riffler where its definition matches the intended context.
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