Uploaded December 2024 | Updated September 2026, 1 week ago

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What's inside a cheap headlamp from AliExpress for 5 USD that runs on an 18650 Li-ion cell. Is it any good? How bright and powerful it actually is? Some modifications and improvements.

The FNIRSI multimeter:
fnirsi.com/products/dmt-99?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013

The DPOX180H oscilloscope:
fnirsi.com/products/dpox180h?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013

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