I thought "smart fingers" would be another "measure your own hands" hack, perhaps with improvements and tips of some sort. Who exactly would buy these things?

I thought "smart fingers" would be another "measure your own hands" hack, perhaps with improvements and tips of some sort. Who exactly would buy these things? They're clearly not designed as a precision measuring tool, but how often do casual users need to measure things? Enough to give up a socket or two to the wall-wart this thing will require?