This is an imaginary instrument that the pilot has to draw on his own when the weather goes hazy because in this situation the pilot is not able to make out the natural horizon. So, this instrument helps him in determining the correct position of an aircraft for ascending or descending.
Useful Links:-
Artificial Horizon or Altitude Indicator
Climbing and descent indicator
Click here to understand the working of a Atificial Horizon
Video Credits-Marvin Flop
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