The SG (strain gauge) is mounted on the forearm. I placed 2.5kg weight on the arm, the SG did the job and everyone is happy forever. Well not really. Not yet. When I applied pressure upwards, the sensor value decreased, which is a good sign so big props to the theory from june 20 log. The battle is on!

Next step is to create a holder for the arm, so that I can further test it (putting it on and off from my arm is agonizing especially if I do it 40 times a day).