Technician A says that shop air pressure usually ranges from 100-150 psi. Technician B says shop air pressure is much higher, around 300 psi. Who is right?

Technician A is correct in stating that shop air pressure typically ranges from 100 to 150 psi. This range is commonly used for various pneumatic tools in an automotive shop setting, providing sufficient pressure for tools while ensuring safe operation and longevity of the equipment.

In contrast, Technician B's assertion that shop air pressure is around 300 psi is not accurate for standard shop operations. Such high pressure can be hazardous and is not necessary for the typical tools and machinery found in a shop environment. Operators would generally avoid pressures significantly exceeding 150 psi due to concerns regarding safety and equipment integrity. Thus, Technician A's information aligns with standard practices in the industry.