Technician A states that a vacuum gauge reads in inches of mercury. What is Technician B's claim?

Technician A correctly identifies that a vacuum gauge measures pressure in inches of mercury (inHg), which is a standard unit of pressure. The vacuum gauge helps technicians evaluate the level of vacuum within a system, as lower pressure readings indicate a stronger vacuum.

Technician B's claim that it reads in kilograms per square centimeter is consistent within the context that it identifies another way to express pressure. This unit is known as 'kg/cm²' and can be used to measure pressure, similar to how pressure can also be expressed in pascals, pounds per square inch, and other units.

Understanding pressure measurements is crucial in automotive systems, as different units may be utilized based on the applications or regional preferences. While other options like liters, pascals, and gallons per hour relate to different physical quantities (volume, pressure, and flow rate, respectively), they do not serve as units for vacuum gauges directly while kilograms per square centimeter describes another aspect of pressure measurement.