In reading the volume of solution in measuring devices, the volume is a must, the eyes are on the same level with the lowest point of a concave arc (meniscus). When a package solution to the measurement volume of these devices. The level of the solution curve concave concave arc of this happening is caused by gravity, the skin between the glass surface with the solution. To find the position of the concave curve minimum might use cardboard, black or white, but must be in black ink, pencil, or underscore. Lead system After telling the volume limit to eye level is on the same level with a minimum of concave arc of fluid and then move the paper up and down until the top edge of the black paper. On the white paper are in line with the minimum of concave curve section it reads the volume directly.
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