It is also called as automatic level or builder's level. Elevations of different points and distance between the points of same elevation can be determined by dumpy level. The telescope is fixed to its supports in dumpy level and hence it cannot be rotated in vertical axis. It is invented by William Gravatt in 1832.
It is widely used in surveying and construction to measure height differences and to transfer, measure, and set heights of known objects or marks. It is also known as a Surveyors level, Builders level, Dumpy level or the historic "Y" level.
Compared to an automatic level, a dumpy level is easier to manipulate but requires more precision from the surveyor. Surveyors will not need to make as many adjustments to a dumpy level as they would to an automatic level, as dumpy levels can retain adjustments for a longer period of time.
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A fantastic range that offers great features at an affordable price. The Leica NA730 Plus, in particular, is considered the most reliable and durable level on the market with 30x telescopic magnification.
What is an RL?
The term Reduced Level is denoted shortly by 'RL'. National survey departments of each country determines RL's of significantly important locations or points. These points are called as permanent benchmarks and this survey process is known as Great Trigonometrical Surveying (GTS).

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