Useful items/equipment you have?

I was wondering what interesting or useful items you have for all manner of things(case building/repair, unique/unusual peripherals, non-standard[but helpful] pieces of tech). Really interested to see what cool or bizarre items you guys have that are more usable or worthwhile than you would think from a first glance.

I have an external Sony USB 3.5" floppy drive.

I have a Dell/ IBM LTO3 tape drive, that I actually got working on a brand new build with a Adaptec 29320 LPE ( PCIE 1x SCSI U320 ) adapter card. drive from 2008, and card from 2007 but for some reason it plays nice with the UEFI bios and win 10

Have a 10gb ibm hdd that still work's i think

i have a wattometer. to meausure my PC's power draw. was very handy in many of my test of stress testing tool and what komponet are best for file servers