# Instruments

> Measurement instrument classes: what each detects, what it cannot detect, the band it covers, and the criteria that separate a usable instrument from a toy.

- Canonical URL: https://emfbase.com/meters
- JSON: https://emfbase.com/api/meters
- CSV export: https://emfbase.com/export/meters.csv
- Records: 12

## Records

- [AC electric field meter](https://emfbase.com/meters/ac-electric-field-meter): Reads power-frequency electric field strength in V/m, the quantity that reveals energised wiring behind a bed head even when no current is flowing.
- [Body-voltage measurement kit](https://emfbase.com/meters/body-voltage-kit): A high-impedance millivoltmeter, a wrist or hand electrode and a ground reference: the standard building-biology method for grading bedroom electric fields.
- [Broadband RF power-density meter](https://emfbase.com/meters/broadband-rf-meter): The general-purpose instrument for Wi-Fi, cellular, 5G, smart meters and cordless phones: reports total power density across a wide band in µW/m² or mW/m², with peak-hold and average modes.
- [Directional antenna (log-periodic or horn)](https://emfbase.com/meters/directional-antenna): Used with an RF meter or analyser to find the bearing of a dominant source, distinguishing a tower on one azimuth from a neighbour's access point on another.
- [Dirty-electricity (line harmonics) meter](https://emfbase.com/meters/dirty-electricity-meter): Plugs into a socket and reports high-frequency harmonic content riding on the mains, the quantity used to judge dimmers, LED drivers, inverters and switch-mode supplies.
- [ELF gaussmeter (power-frequency magnetic field)](https://emfbase.com/meters/elf-gaussmeter): Measures 50/60 Hz magnetic flux density in milligauss or microtesla — the instrument for wiring faults, service panels, transformers and power lines.
- [Intermediate-frequency magnetic field meter](https://emfbase.com/meters/intermediate-frequency-meter): Covers the kilohertz gap between an ELF gaussmeter and an RF meter — the band occupied by induction hobs, EV inverters, solar optimisers and switch-mode supplies.
- [Light flicker meter](https://emfbase.com/meters/flicker-meter): Measures modulation depth and frequency of a light source, the optical counterpart to dirty-electricity measurements and the metric behind LED comfort complaints.
- [Logging EMF instrument](https://emfbase.com/meters/data-logger): Any of the above with unattended recording: required whenever the assessment depends on an average, a night-time value or a 95th percentile rather than a spot reading.
- [Microwave oven leakage tester](https://emfbase.com/meters/microwave-leakage-tester): A 2.45 GHz probe scaled for the FDA leakage limit of 5 mW/cm² at 5 cm — a range where ordinary consumer RF meters saturate.
- [Oscilloscope line adapter](https://emfbase.com/meters/oscilloscope-line-adapter): A protected coupling that lets an oscilloscope show the actual mains waveform and its harmonic content, replacing a proprietary dirty-electricity index with a measurable spectrum.
- [RF spectrum analyser](https://emfbase.com/meters/spectrum-analyser): Resolves a reading into its constituent services and frequencies — the only way to attribute an RF level to a specific band, operator or device.