57.) Technician A says that a scan tool can be used to verify engine operating temperature. Technician B says that a refractometer can be used to verify engine operating temperature. Who is right? A. A only B. B only OC. Both A and B OD. Neither A nor B

## Step 1<br />Technician A's statement is about using a scan tool to verify engine operating temperature. A scan tool is a device that can read the data from the engine's onboard computer. This data can include the engine's temperature, among other things. Therefore, Technician A's statement is correct.<br /><br />## Step 2<br />Technician B's statement is about using a refractometer to verify engine operating temperature. A refractometer is a device used to measure the concentration of electrolytes in the engine coolant. This measurement can be used to infer the engine's temperature. Therefore, Technician B's statement is also correct.