TRUE YELLOW LASER or not? 25+ years wait over? // Valkyrie 573 donated by Tinker Lasers

LASER underpowered by its power supply? | First TTL/PWM Arduino attempt

MAGNETIC PAINT | Cheaper and easier than Ferrofluid and Ferripaste?

Mystery RADIOACTIVE Source | Can we identify it?

Upgrading Fiber Optic Lamps to LASER Brightness!

Monster magnet meets monitors...

YELLOW LASERS?!? Finally - after 25+ years of collecting!

Messing Up the Fluorescence of Tonic Water - in several ways...

GLOW-IN-THE-DARK: Can you change the color?

Desert Sun Lamps! | My least healthy lights yet?

Are cheap UV detection cards any good?

Monster magnet meets aluminum can...

Smartphones measure MAGNETISM in 3D?!? | Gaussmeter in your pocket?

New LASER Power Record on my LPM?!? | LaserCube Ultra 750K Subs Special

Hidden Hazards of Halogen Lamps

Smartphone vs. Real Meters for Sound and Light Measurement?

Monster magnet meets subwoofer...

How [NOT] to MAX test a power supply!

Bananas can detect invisible light?!?

Handheld DNA eraser?!?

Invisible light will make 'Gold of the North' visible?

New King of Magnetic Power? | Electromagnet vs. Neodymium Magnet

PRO vs. DIY | Is my laser beam dump any good?

Ingenious hybrid lamp sold in a MINDLESS way...

Laser COLOR limits data capacity?!?

MAGNET MYSTERY | Help me explain it!

How bad is this cheap laser power meter? | HWLPM Mini 10W vs. Sanwu Tracer 20W

Radioactive Mushrooms vs. Affordable Gamma Spectrometer | This beats ALL Geiger counters!

Metal in Food and Drinks | Ban incoming!

Crazy difference between 5W LASER and 5W LED!