I spent a whole morning going from shop to shop trying to find a ball shape that has the right diameter for the scale I wanted. I found a tea ball from WalMart which fit the bill the best.

Electronics projects, experiments, tutorials, and more!
The Blog for Potato Hackers, Diet Hackers, and VegetablePharmers
Arduino and related stuff (including Attiny and ESP8266) and the Raspberry Pi
Most trippy.