What kind of a gauge will read both positive and negative pressure?

Question

Quizplus · Accepted Answer

A compound gauge is designed to read both positive and negative pressure. It is typically used in refrigeration and air conditioning systems to measure both vacuum pressure during the evacuation process and positive pressure during normal operation. A micron gauge (A) only measures very low pressure, while a high pressure manifold gauge (C) and a gauge that reads in PSIA (D) only measure positive pressure.

What Kind of a Gauge Will Read Both Positive and Negative