#3047: Rotary Tool

XKCD comic, described below.
Transcript

Multi-function rotary tool

[A slider on the side of a tool with various settings.]

Speed (rpm) Function

0.000000000073: Sidereal mount precession adapter

0.00070: Sidereal telescope mount

[Following three are labeled "clock hands":]

0.0014: h

0.017: m

1: s

[Following three are labeled "record player":]

33: 33

45: 45

72: 72

300: Screwdriver [Current setting]

1500: Drill

2500: Airplane propeller

35 000: Dremel

60 000: Uranium enrichment centrifuge

300 000: Dental drill

(Sourced from explainxkcd.com)

It was great until my thumb slipped and I accidentally launched my telescope into the air at Mach 8.

ExplainOriginal