Extech magnetic field meters, such as the MF100 and SDL900 models, are instruments for measuring AC and DC magnetic fields using a Hall effect sensor with automatic temperature compensation. They are used for a variety of applications, like testing power lines, electric motors, and household appliances, by providing readings in both Gauss (G) and milliTesla (mT) units. Key features include North/South pole indication, data and min/max hold, and in some models like the SDL900, data logging capabilities.
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