This simple and easy to use device is used to determine the size of footwear.
The flat bar is inserted in the shoe and pushed into the toe. The slider is then moved along the scale until the curved bar touches the heel. The longest length can be found by moving the device vertically and locating the curved bar to the point of maximum heel curvature. At this point the size of the footwear can be read off the scale.
There are four versions of the internal shoe size gauge which cover the adults' sizes 11-14 and children's sizes 4-7:
- STD 225E Adults’ scale in English sizes
- STD 225M Adults’ scale in millimetres
- STD 225C Children’s scale in English sizes
- STD 225CM Children’s scale in millimetres.