# proton magnetometer

> instrument which measures very small variations in the Earth's magnetic field

**Wikidata**: [Q459438](https://www.wikidata.org/wiki/Q459438)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Proton_magnetometer)  
**Source**: https://4ort.xyz/entity/proton-magnetometer


## References

1. Freebase Data Dumps. 2013