冷光掠过钢尺，把加工痕迹照清楚

One 3:2 precisionist product photograph of a closed brushed-steel caliper laid diagonally across dark blue stone. Cool hard light casts a long crisp shadow, revealing machined edges and subtle scratches. A small brass sphere rests near the jaws as a material contrast. Restrained industrial still life, accurate plausible tool geometry, no readable markings or watermark.

一张3:2精确主义产品摄影：闭合的拉丝钢卡尺斜放在深蓝石面上。冷调硬光投出长而清晰的影子，显露加工边缘与细微划痕。钳口附近放一颗小黄铜球作材质对照。克制工业静物，工具几何准确合理，没有可读刻度或水印。