The relative humidity in an incubator is usually set at? By: Sunday|Published on: Dec 20|Categories: Agricultural Science WAEC| 0 comments A. 10% – 30% B. 40% – 60% C. 70% – 80% D. 90% – 100%. Correct Answer: Option B = 40% – 60% Users Also Read These:Which of the following instruments may be used to…Which of the following instruments is used to…Which of the following instrument may be used to…When there is a large difference in the reading of…The instrument used to measure the relative humidity is?SEE ALSO The most suitable source of power for stationary equipment on a farm is?