Easy. You put them next to your left sock (the right one is in the sock drawer).
Legs.
They still are.
Why not? Your probes are.
Either that, or the old ones will show up. Because you're a neatnick you'll put them all in the same place and...
Same deal with pens and pencils. I now buy them by the bundle and leave them everywhere. No matter where I am a pen(cil) is within sight. Screwdrivers too. I have enough socks to keep the washing machine fed for a decade (hint: buy 'em all the same color).