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When we measure black or dark objects, due to the fact that the scale of ruler is black and its brightness is similar to those of objects, it becomes rather difficult to identify the scale quickly and accurately.
Now, we change the color of scale into gradient color from black to white. Thus, no matter how bright the color of objects we want to measure, clear scale can always be identified accurately and immediately.
Ecoflow Technology Limited
CHINA
Shenzhen, China
Zhiyong Zhao/Haibin Zheng/Qiwen Wu/Wutian Pan