Specialty electromagnetic sensors and instruments are proprietary electrical and electromagnetic sensors and instruments not explicitly listed elsewhere. There are several types of specialty electromagnetic sensors and instrument. Examples include electromagnetic instruments, electromagnetic sensors, robotic sensors, AC gauss meters, electric field meters, and RF field strength meters. An electromagnetic instrument measures a geomagnetic field along three components of the earth’s magnetic field. An electromagnetic sensor determines linear movement. A robotic sensor is used for complex environment monitoring. An AC gauss meter is used for measuring AC magnetic fields. An electric field meter is used to detect electric field pollution in the home or office. An RF field strength meter is used for measuring the RF magnetic fields in the home or office. Other types of specialty electromagnetic sensors and instruments are commonly available.