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Specifications: 74mm*33mm*5mm
It is a common biological tool
The platform in the middle is wider, and the middle is divided into two halves by a short horizontal groove

Each grid is divided into nine large squares, and the central one is a large square
There are two scales in the counting area: one is that the counting area is divided into 16 middle squares (the large squares are separated by three lines), and each middle square is divided into 25 small squares; the other is a counting area It is divided into 25 Chinese squares (the Chinese squares are separated by double lines), and each Chinese square is divided into 16 small squares
The side length of the counting area is 1mm, then the area of the counting area is 1mm2, and the area of each small square is 1/400mm2
1mm, so the volume of each counting area is 0