The switch on the sensor shaft is used to select the range. On the 6.4 mT range, each volt measured by the transducer represents 32 gauss (3.2 × 10-3 tesla). The range of the sensor is ±64 gauss or ±6.4 × 10-3 tesla. On the 0.3 mT range, each volt measured represents 1.6 gauss (1.6 × 10-4 tesla). The range of the sensor is ±3.2 gauss or ±3.2 × 10-4 tesla.