Which device is specified for measuring test pressure in piping systems?

The specified device for measuring test pressure in piping systems is a calibrated manometer or pressure measuring device. This choice is correct because calibrated manometers are designed to measure pressure accurately and are essential for ensuring that the piping system can safely handle the operating pressures.

Calibrated instruments ensure that measurements are consistent and reliable, which is crucial during testing to confirm that the system is leak-free and operating within safe limits. Accurate pressure readings are vital for compliance with safety regulations and preventing potential hazards.

Other devices, such as temperature gauges or uncalibrated digital indicators, do not provide the necessary functionality for pressure measurement. Moreover, a simple mechanical gauge with no range limitations may not offer the required precision and could lead to unsafe conditions by not accurately reflecting the pressures within the system. Thus, the use of a calibrated manometer specifically designed for pressure measurements stands out as essential for maintaining safety and compliance in piping systems.