This is a phase tester screwdriver, there's a small bulb inside that illuminates if the tip comes in contact with a live wire. I thought it'd be fun to try to reproduce the cloudy plastic it's made from, and see how raytraced refraction in Toolbag 4 would handle the internal geometry. There were some hairline cracks and subtle damage I tried to recreate in the plastic surround of the shaft.
Physics test
Testing raytraced plastic with internal geometry