Which of the following would you include when measuring specific gravity with a refractometer?
A. Clean the refractometer and dropper every three days
B. Turn on the light and look into the eyepiece to measure refraction
C. Calibrate the refractometer once a week
D. Use a specimen that was collected at least 2 hours ago
E. Place three drops of the specimen under the lid of the refractometer
Answer: B
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