Scales

This is Meccano Super Model 7, the plans for which are available here.

 

The mechanism is prototypical, and allows weight to be placed anywhere on the plate but still accurately register. And the scales are surprisingly accurate!

 

iPhone apps

RPG Dice Roller - speed up boardgames and RPGs by making dice rolls with a single touch.
Baby Name Chooser - help choose the right name for your baby.

at Langston Publishing