Fluidik is a glass scale that shows a user’s weight using fluid flowing through a graduated tube. When weight is applied on the scale surface increased weight will squish the fluid further in the tube.
Via: Laughing Squid
“There is a compression port and bleed valve in the front edge of the scale for calibration. The user can adjust the scale by turning the silver dial located on its face which makes micro height adjustments to the platform. Doing so zeros in the fluid to compensate for fluid expansion/contraction based on the user’s climate and ambient temperature.”