Which of the Following Would You Include When Measuring Specific

Multiple Choice

Which of the following would you include when measuring specific gravity with a refractometer?

A) Use a specimen that was collected at least 2 hours ago
B) Calibrate the refractometer once a week
C) Place three drops of the specimen under the lid of the refractometer
D) Turn on the light and look into the eyepiece to measure refraction
E) Clean the refractometer and dropper every three days