Frequency response and range describe what frequencies a meter can detect and measure reliably. This attribute tells you the band of signals the instrument was designed for — from narrow ELF bands used in power-line and appliance testing, up through VHF/UHF and into the GHz range where cell towers, Wi-Fi and other wireless sources live. Knowing a meter’s frequency range helps you match the tool to the job: a meter that reads 50 Hz–5 kHz is suited for low-frequency electrical environments, while one covering MHz–GHz is required to evaluate RF sources like routers, base stations and wireless devices.
Frequency response also communicates the meter’s sensitivity across that span. Some meters provide broad, even sensitivity across the whole band; others are optimized for clarity in a specific slice of the spectrum. For practical users, this means the meter will be more accurate and informative when used inside the ranges it was designed for. Professionals rely on this attribute to choose instruments that capture the signals of interest without misleading readings or gaps.
When considering instruments, look for clear frequency specs and examples (e.g., “45 Hz – 6 GHz”) and pair them with the antenna and measurement mode you plan to use. That combination — range, response curve, and the right antenna — determines whether the meter will give you meaningfully useful data for troubleshooting, documentation, or everyday home checks.
