Grayscale Numbered Calibration Chart with Circular Target Markings 插畫檔

A grayscale calibration chart displaying a grid of numbered squares from one to ten, each containing circular target and crosshair markings. The image is presented in a clean, technical style on a light background, emphasizing contrast, alignment, and numeric reference. Suitable for illustrating measurement, testing, quality control, or visual calibration concepts with a neutral, analytical mood.