If you're a certain kind of coffee geek, you've heard of WDT, also known as "stirring the dose with a paper clip, or a dissecting needle if you're fancy." This thing is an aid to doing it with acupuncture needles instead. They're so fine they slice right through clumps, leaving a coffee bed like well tilled soil. Nice! But they're also so fine that it's slow going if you do it with just one needle. This device holds five of them to make a little brush that's very fine but still very quick.
Not for sale as this is a prototype and I don't yet know if I have the dimensions and tolerances right.