Bathroom Scale Scheme (Digital Type)

1) When someone steps onto the scale, the metal inside the sensor bends.
2) When the metal bends, it changes the resistance value of the "strain gauge" stretched across the metal.
3) The changes in the resistance values of the four sensors are converted into figures that indicate body weight.

Bathroom Scale Scheme (Analog Type)

1) When someone steps onto the scale, the body weight comes to rest on the main point of the "lever" beneath the stand, thereby stretching the "spring."
2) The vertical movement of the lever tip is converted into horizontal directional movement by a "link lever," with gears turning to rotate the scale plate and display body weight.