Enter a clue or pattern or both:
The Clue
Servopneumatic instrument (9 letter answer)
The Answer
ALTIMETER
Tags
Notes
The answer ALTIMETER is so rare that it appears less than once every 2500 puzzles.
Related Clues
Height gauge
Instrument measuring elevation
Definition
ALTIMETER as a noun:
1. an instrument that measures the height above ground; used in navigation