A pressure calibrator is a device used to measure and adjust the accuracy of pressure instruments, such as gauges and transmitters. It generates a known pressure that can be compared to the readings of the instrument being tested, ensuring that it provides accurate measurements in various applications. These calibrators are essential in industries like oil and gas, manufacturing, and laboratories, where precise pressure readings are crucial for safety and efficiency. By regularly calibrating pressure instruments with a calibrator, organizations can maintain compliance with industry standards and improve the reliability of their equipment.