Measuring instrument looks the same from both ends (5)

I believe the answer is:

radar

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'measuring instrument' is the definition.
(radar is a kind of measuring instrument)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for radar that I've seen before include "System for detecting things using radio waves" , "Pulsed location-finder" , "Method of detection" , "Remote range sensor" , "Electronic detection system" .)

I've seen this clue in The Hindu.

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