Fluke 381 User Manual page 13

Remote Display True-rms Clamp Meter
Features
The Meter base and display can be a maximum of 10 meters from each other before the radio
signal connection is broken. This distance can change with the obstacles between the Meter base
and display. There is a radio connection when  shows in the display.
To detach the display from the Meter base, see Figure 1.
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ghn10.eps
Figure 1. Remote Display
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