G D Instrument Service is a Nashik (Maharashtra) based company that offers premium diameter setting plug calibration. Our calibration service has been immensely praised as we make use of the advanced calibration equipment, and deploy only qualified engineers to calibrate clients’ diameter square plugs. We have a team of qualified calibration engineers that specializes in ensuring that the instruments and equipment like diameter square plugs stands are calibrated well, exactly for their standard readings and the highest tolerance range.