I’m assuming it is a kitchen implement because it is made of aluminum and has a “green” wooden knob as the handle. There is no name, marks or numbers anywhere on it that I can see.
It stands 6” high and 6” across any 2 of the 3 compartments. Each compartment is 2 ¾” in diameter.
As you can see from the 1st picture, the knob is attached to a spring loaded shaft, …. that extends thru a hollow tube which has 2 “finger holds” at its top and which is part of the 3 compartment thingy ……. and the end of the shaft is fixed permanently to the base.
The base is made to match up with the 3 compartment thingy and there are approximately 40 tiny holes for each of the 3 compartment thingys.
And via the 2nd picture you can see what happens when the knob and “finger holds” are squeezed together.
So, …….. “What izit”, ……. I don’t have a clue as yet.