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What instruments are used to measure electromagnetic waves?

Answer 1

Radio, microwave, infrared, visible telescopes.

Electromagnetic waves are a very broad spectrum. The devices used to measure them are designed to respond in some way to their presence (detection). These are usually various forms of antennae for radio and microwaves, and optics/CCD for infrared and visible light.

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Answer 2

Leah Angelini

The instruments used to measure electromagnetic waves include:

Antennas
Spectrum analyzers
Oscilloscopes
Gaussmeters
Magnetometers
Radiometers
Electromagnetic field meters
Microwave detectors
Radio frequency (RF) meters
Electric field meters

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.