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By kosi Emmanuel chukwujindu

Kosi Emmanuel Chukwujindu
Architect: How to make your own Range device
As Architects and project supervisors we often require perfectly level/flat surfaces for floors, walls, lintels e.t.c. To achieve this, the practice is to make use of a device called the plumb. It is a horizontal steel pipe with a liquid trapped in a clear glass such that when the pipe is placed on a level surface, the air space is exactly at the center. This will indicate to the Architect or supervisor that the given job is okay. 
The challenge however is that for large  construction projects that have a lot of edges/surfaces to be confirmed, it may be quite expensive to procure the plumb device in large numbers. Moreso if there is no guarantee that they will all be returned after use. It becomes very wasteful to provide one plumb for each worker. In such case, about 2-3 workers can be assigned a plumb device while an alternative instrument -the range, is shared among all.
The range is similar to the plumb in shape. It is also a steel pipe which is about 6ft. Long x 1" wide. But it does not have the liquid trapped in clear glass. It is usually made of heavier metal than the plumb. It is especially useful in verifying how level a surface is. It can be used in the vertical or horixontal positions. And it is far cheaper than the plumb. It can be easily found at building materials markets or stores, but it is cheaper to make your own. 
Visit your local welder or steel pipes vendor,and ask for the 2" x 1" x 24' hollow steel pipe. In Enugu state, This sells for about N900. 
Step 2: 
Ask him to cut same into three pieces each  of 6' lenght. (Nb: you may vary this according to how much length you require). 
Step 3:
Ask him to weld some scrap metal over the two open ends of each pipe to prevent sand and other debris from entering the pipes while in use at the site. 
Once this is done, congratulations you have your self made range device ready for site work!