# Measurement protocols

> Reproducible measurement procedures: goal, equipment, ordered steps, pitfalls, and the limits to interpret results against.

- Canonical URL: https://emfbase.com/protocols
- JSON: https://emfbase.com/api/protocols
- CSV export: https://emfbase.com/export/protocols.csv
- Records: 7

## Records

- [Body-voltage measurement](https://emfbase.com/protocols/body-voltage-survey): The building-biology method for grading a sleeping area's AC electric field: a high-impedance millivoltmeter, a hand electrode, and a documented ground reference.
- [ELF magnetic field survey](https://emfbase.com/protocols/elf-magnetic-survey): A source-finding walkthrough plus a 24-hour log, because power-frequency magnetic fields track electrical load and a spot reading answers almost nothing.
- [Identifying a nearby tower from public records](https://emfbase.com/protocols/tower-lookup): How to establish what is actually on a mast — height, azimuth, licensee — from the FCC Antenna Structure Registration and licence databases before estimating exposure.
- [Looking up a phone's SAR from the primary record](https://emfbase.com/protocols/sar-lookup): How to get the tested SAR for a specific handset from the FCC equipment authorization database using the device's FCC ID, instead of relying on third-party lists.
- [RF room survey](https://emfbase.com/protocols/rf-room-survey): How to measure radiofrequency exposure in a room so the result is reproducible: peak and average, at body positions, with the dominant direction identified.
- [Shielding verification](https://emfbase.com/protocols/shielding-verification): How to prove a shielding measure worked: identical instrument, position and source conditions before and after, reported in dB as well as in absolute units.
- [Sleeping-area assessment (full four-quantity survey)](https://emfbase.com/protocols/sleeping-area-assessment): The combined survey building-biology practice applies to a bedroom: RF power density, AC magnetic field, AC electric field and body voltage, each graded against its own band.