Figure 3From: Investigating mosquito net durability for malaria control in Tanzania - attrition, bioefficacy, chemistry, degradation and insecticide resistance (ABCDR): study protocol Mosquito net hole counting by zone. Collapsible metal frame (170Â cm x 180Â cm x 190Â cm) using locally available materials divided into four 37.5Â cm zones from the top to the bottom in order to count holes by zone under laboratory and field conditions.Back to article page