| 摘要 |
PROBLEM TO BE SOLVED: To provide a display with satisfactory visibility capable of performing both a graphic display and a digital display by a user's selection of a sensor apparatus. SOLUTION: A photoelectric sensor 11 comprises a level display part (28). The level display part (28) is constituted by arranging a plurality of seven- segment displays (33). Parts of the segments of the seven-segment displays (33) are constituted of red LED segments (33b), and parts of the segments are constituted of red/green two-color LED segments (33a). In the case of the digital display, all the segments are made to emit a red color to display numbers. In the case of the graphic display, the red/green two-color LED segments are made to emit a green color to display a bar graph.
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