Most commonly, spectrum analysers are used in the telecommunications industry. Engineers use them to test transceiver equipment such as 5G, LTE, Wi-Fi or satellite systems. Depending on specific features and functions, GAO Tek's spectrum analyzers are sometimes referred to as frequency analyzers, signal spectrum analyzers,rf spectrum analyzers, waveform analyzers, spectrum scanners, frequency response analyzers, signal spectrum scopes, spectrum analyzing instruments. A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument. Its primary task is to show how the signal's energy is distributed across different frequencies.