What's a microscoop? I've bought pure caffeine powder and its serving size is said to be a microscoop, but no measure of weight is given.

So what's/what size is a microscoop?



"Microscoops" can be found from the internet, but their size is 7-12mg. Is this reasonable for caffeine?
Yes, 7-12mg is a perfectly reasonable, very conservative amount. 12mg of caffeine is about equal to the amount of caffeine in a liquid ounce of 'average' coffee. (Source USDA)

Take care not to pack the scoop. Pure caffeine is a potentially dangerous ingredient. Microscoops vary even more than what is implied by your question, I've seen them as large as 50mg; a comment here tells of a 100mg microscoop.  Again, take care, and know exactly what you have.

For greater accuracy, consider a milligram scale which can be had for about $20 US.