A device for making NMR measurements in a double‐coil nuclear induction system under axial stress on single crystals in excess of 10 000 psi or hydrostatic pressure on powders, single crystals, or other materials up to 10 000 psi has been constructed of Fiberglas. This device is simple in design and operation and is relatively inexpensive. Results of measurements on I127in NaI powder, which exhibit the expected decrease in intensity with pressure, are given.