With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Henri Poincare was a surgeon.
text_B: A magnetometer is an instrument that measures magnetism -- either magnetization of magnetic material like a ferromagnet , or the direction , strength , or the relative change of a magnetic field at a particular location .. magnetization. magnetization. ferromagnet. ferromagnet. magnetic field. magnetic field. A compass is a simple example of a magnetometer , one that measures the direction of an ambient magnetic field .. magnetic field. magnetic field. compass. compass. The first magnetometer capable of measuring the absolute magnetic intensity was invented by Carl Friedrich Gauss in 1833 and notable developments in the 19th century included the Hall Effect , which is still widely used .. Carl Friedrich Gauss. Carl Friedrich Gauss. Hall Effect. Hall Effect. Magnetometers are widely used for measuring the Earth 's magnetic field and in geophysical surveys to detect magnetic anomalies of various types .. magnetic field. magnetic field. magnetic anomalies. magnetic anomalies. They are also used in the military to detect submarines .. Consequently , some countries , such as the United States , Canada and Australia , classify the more sensitive magnetometers as military technology , and control their distribution .. Magnetometers can be used as metal detectors  : they can detect only magnetic -LRB- ferrous -RRB- metals , but can detect such metals at a much larger depth than conventional metal detectors ; they are capable of detecting large objects , such as cars , at tens of metres , while a metal detector 's range is rarely more than 2 metres .. metal detectors. metal detectors. ferrous. ferrous. In recent years , magnetometers have been miniaturized to the extent that they can be incorporated in integrated circuits at very low cost and are finding increasing use as compasses in consumer devices such as mobile phones and tablet computers .
not_related.