| 摘要 |
A measuring strip which contains on a transparent base a test field divided into at least two sub-fields, wherein (1) a first sub-field (F1) contains a plurality of individual areas each containing a group of opaque dots, wherein each individual area has dots of substantially equal size uniformly distributed in a transparent background area, and wherein (2) a second sub-field (F2) contains a plurality of individual areas each containing a group of transparent dots (holes), wherein each individual area has transparent dots of substantially equal size uniformly distributed in an opaque background area, and wherein in each individual area containing (opaque or transparent) dots having substantially the same dot size the dots are at substantially equal distance from each other, so that an area containing dots of smaller size compared with another area containing dots with larger size contains more dots than said area containing dots of larger size, and wherein the transmission of said first and second sub-field being expressed in percentage is different by at least 10 %.
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