The underlying principle behind load cells lies in the use of strain gauges, which form the core sensing technology of these devices. Structurally, a load cell is built from a metal elastomer, typically aluminum, alloy steel, or stainless steel, to which foil strain gauges are meticulously bonded. When a load cell is subjected to stress—be it force, weight, or torque—the material of the elastomer undergoes deformation or displacement. This deformation results in strain, which the strain gauges detect and convert into measurable electrical signals.