Haltec in Mountain View (not to be confused with Halted in Sunnyvale) used to have one on display; it was about a meter width I seem to recall. There was a sign

Haltec in Mountain View (not to be confused with Halted in Sunnyvale) used to have one on display; it was about a meter width I seem to recall. There was a sign on it: "Warning: Sets Fires Instantly". (Haltec is gone now, but I seem to recall some serious lasers still available at Halted.)