Device used as a standard for the calibration of pressure gauges is a

ANS:C - dead weight pressure tester

A dead weight pressure tester is a device used as a standard for the calibration of pressure gauges. Dead weight testers operate based on the principle of balancing a known weight against the pressure generated by a fluid, typically oil or water, within a sealed chamber. By applying known weights to a piston or plunger, the pressure generated by the weights can be precisely calibrated and used to calibrate pressure gauges. Therefore, the correct option is: dead weight pressure tester