Which of the following direct pressure measuring instruments is most appropriately used for measuring extremely high pressures up to 80,000 psig?

Correct Answer: Option C — Helical type pressure gauge

Helical Bourdon tubes are specifically engineered for high-pressure applications. By winding the tube into a multi-turn helix, the stress is distributed over a greater length of material, allowing the device to withstand pressures up to 80,000 psig while maintaining accurate mechanical deflection for the gauge pointer.