Mail Call #27: Calibration Circuits, Battery Holders, Analog Meters and More from AliExpress

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In this video we open the following in the mail from AliExpress.

As I mention in the video I learned about the AD584LH and Resistor Board over here: Brymen BM789 Unboxing and Review.

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Yum Cha 100pc Titanium Plated Drill BitsThis is an image of the product.notes

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