Magnatip (the magnetic tip for tape measures!)
Measuring tape-- it's so cool! You know what would make it cooler? A magnet! This Magnatip makes measuring long distances easy, or so this device claims. it fits most 1" wide measuring tapes, and it snaps on and off like a dream. This is a must-have for any sort of tradesperson who likes magnets and measuring tape. Oh, you know, and measuring things correctly.
95 cents each!