| 摘要 |
PROBLEM TO BE SOLVED: To enhance measuring performance by integrating a test head and a light source, and to easily reduce a size. SOLUTION: This tester is provided with a light source part 33 for irradiating a measuring device, a test head 3 and a performance board 4. The test head 3 is provided facing to the performance board 4, a through hole 32 is provided in a central part of the test head 3, and the light source 33 is provided in the through hole 32 of the test head 3.
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