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  Cantilever beam can be used for measurement up to 10 kg of weight.  One end of the cantilever is fixed, while the other end is free; the load is applied at this end, as shown in Figure below.  The strain developed can be measured by fixing strain gages at the fixed end:  two on the top side (gauge no. 1 and 3) of the beam, measuring tensile strain +ε and  two on the bottom side  (gauge no. 2 and 4)  measuring compressional strain – ε

Force and weight relationship The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = m*g. Since the weight is a force, its SI unit is the newton. For an object in free fall, so that gravity is the only force acting on it, then the expression for weight follows from Newton's second law. Force measurement using a load cell A Load cell is a force transducer intended for weight measurement that generates an electrical signal whose magnitude is directly proportional to the force being measured. Commonly types of load cells There are four common types of load cells.   Pneumatic  Hydraulic Capacitive Strain gauge  Pneumatic load cells:  Let us now understand how a pneumatic load cell works. Since it is a pneumatic load cell, we know that it will deal with air pressure. Construction:  A pneumatic load cell consists of an  elastic diaphragm attached to a platform surface where the weight will be pla