Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Doctor Who:  D'you know what that is ?
D.84: It is a Laserson probe . It can punch a fist - sized hole in 6 " armor plate or take the crystals from a snowflake one by one .
Doctor Who: Yes . That 's right . No handyman should be without _ one _ .

probe