Abstract: In a test strip measuring method in which a coloration measurement is conducted while a test strip (4) is being moved, there are detected the optical characteristics R of the ground of a test strip and the optical characteristics T of a test line (4b) which has appeared on the test strip, and the test strip is judged based on the difference or ratio between R and T. Even though the ground of the test strip presents variations in optical characteristics, and even though there are variations among samples or among test strips, such variations can be absorbed, thus assuring an accurate judgment.

Abstract: In a test strip measuring method in which a coloration measurement is conducted while a test strip (4) is being moved, there are detected the optical characteristics R of the ground of a test strip and the optical characteristics T of a test line (4b) which has appeared on the test strip, and the test strip is judged based on the difference or ratio between R and T. Even though the ground of the test strip presents variations in optical characteristics, and even though there are variations among samples or among test strips, such variations can be absorbed, thus assuring an accurate judgment.

Abstract: In a test strip measuring method in which a coloration measurement is conducted while a test strip (4) is being moved, there are detected the optical characteristics R of the ground of a test strip and the optical characteristics T of a test line (4b) which has appeared on the test strip, and the test strip is judged based on the difference or ratio between R and T. Even though the ground of the test strip presents variations in optical characteristics, and even though there are variations among samples or among test strips, such variations can be absorbed, thus assuring an accurate judgment.

Abstract: A thickness of a liquid crystal cell is measured by placing a liquid crystal cell having a twist angle of .theta. between a polarizer and an analyzer, by measuring the strength of transmitted light through the analyzer with the polarizing angle of the polarizer tilted by 45.degree. from the orientation of the liquid crystal cell at its entry surface, and the polarizing angle of the analyzer tilted by further 45.degree. from the orientation of the liquid crystal at its output surface, by calculating retardation d.DELTA.n from the measured light strength, and by deriving a cell thickness d from both the retardation d.DELTA.n and a known birefringence .DELTA.n of the liquid crystal cell. Since this method provides the distribution of thickness data of liquid crystal cells, good quality liquid cells with uniform construction and thus without color shade can be selected.