The spinning riffler is often used to obtain small sub-samples of a powder, but the move to the use of finer powders in industrial situations presents obstacles to the use of the spinning riffler. A new mixer/sampler being developed at Laurentian University, called the Free-Fall Tumbling Mixer/Sampler, offers several advantages in the taking of small representative sub-samples of a powder as well as providing an efficient manner in which to mix small batches of powder. The design and operation of the mixer/sampler are discussed, and typical data presented.