A reading on a surveyor's instrument taken backwards to a previously established point, often used in leveling

पिछले बिंदु पर लिया गया सर्वेक्षण माप

English Usage: The surveyor took a back sight reading to ensure the measurements were accurate.

Hindi Usage: सर्वेक्षक ने मापों की सटीकता सुनिश्चित करने के लिए पिछला दृष्टि पढ़ना किया।