ebay

Styropyro tests an eBay laser tattoo removal device and finds it is a roughly million-watt pulsed laser, powerful enough to ignite air in the beam. He had bought it hoping to salvage an Nd:YAG laser cavity.

At DEF CON 27, Nina Kollars tells how buying Nespresso capsules on eBay led her to investigate fraudsters reselling goods bought with stolen credit cards. She describes her non-technical tracking and reporting efforts.

Jeri Ellsworth shows step by step how to make an NMOS transistor at home using a kiln, rust remover, spin-on dopant, eBay wafers and vinyl stickers.

BigClive tears down and tests a germicidal UVC lamp from eBay that floods a room with narrow-band ultraviolet and ozone. He warns of the eye and skin hazards.

Ben Krasnow of Applied Science shows how to make and test YBCO high-temperature superconductor with a kiln and eBay chemicals. He demonstrates flux pinning and shows a close-up of the crystal structure.