A magnetometer lets archeologists measure magnetic strengths and detect buried artifacts without digging and destroying a site. It gives them a better idea of where to dig. The Earth acts like an enormous magnet, with north and south magnetic poles. Buried objects can also have a magnetic field. This instrument can detect the magetic fields that buried objects produce.

Definition: an instrument used to measure magnetic variations and detect buried objects
Parts: sensor, data storage unit, cable, power supply
Units of measurement: magnetic field strength measured in gammas
Cool fact: Magnetometers cannot detect bronze or silver.

Image credits: main image, AMNH, David Hurst Thomas.