The relative humidity in an incubator is usually set at? by Sunday | Dec 20 | 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 instrument can be used to…Which of the following is used to measure relative humidity?Which of the following instrument may be used to…Which of the following instruments is used to…High relative humidity will be expected in Zones?