I just bought this current probe but was greeted with a rattling sound when shaking the probe. This video is a partial teardown of the AEMC / Chauvin Arnoux SL261 clamp meter / probe. It's rated for up to 100A and has 100kHz of bandwidth.

Sadly, it turned out that the loose part was inside a portion of the unit that is glued or welded shut.

This probe is also rebranded and sold by several other companies including Tektronix, Fluke and HP/Agilent/Keysight.

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