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The Trek® 520 voltmeters are not your typical hand-held field-meter. Their measurement technology provides surface voltage measurements that are essentially independent of the sensor probe-to-measured surface spacing.
Trek 520 is available in two versions. The 520-1 has a digital meter to display the measured voltage. The Trek 520-2 has an analog output monitor in addition to the digital display. This analog output monitor can be used to record the measured voltage or to view it on an oscilloscope. Always use the original grounding cord without any safety resistor; failure to do so will lead to measurement errors.
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