Comment on Why It Was Almost Impossible to Make the Blue LED

<- View Parent
heckypecky@lemmy.dbzer0.com ⁨9⁩ ⁨months⁩ ago

Handheld battery powered X-ray devices exist and are widely available. I used to work with those. In Germany you need a permit to operate them. www.thermofisher.com/order/catalog/product/…/XL2

source
Sort:hotnewtop