Run away the ray-gun is coming : We test US army's new secret weapon

Modern face of warfare: The Silent Guardian

"Where do I put my finger? There ... OK? Nothing's happening ... is it on?"

"Yes, it's on. Move your finger a bit closer."

"Er ... ow! OW!" Not good. I try again. "OWWW!" I pull my hand away sharpish. My finger is throbbing, but seems undamaged.

I was told people can take it for a second, maximum. No way, not for a wimp like me.

I try it again. It is a bit like touching a red-hot wire, but there is no heat, only the sensation of heat. There is no burn mark or blister.

Its makers claim this infernal machine is the modern face of warfare. It has a nice, friendly sounding name, Silent Guardian.

I am told not to call it a ray-gun, though that is precisely what it is (the term "pain gun" is maybe better, but I suppose they would like that even less).

And, to be fair, the machine is not designed to vaporise, shred, atomise, dismember or otherwise cause permanent harm.