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Step 3Reference Point
After placing your reservoir down DO NOT MOVE IT or you will have to redo the next steps all over.
Place the base of your measuring ruler on the point you want everything else to reference from.
This is called your base level or reference level.
Don't worry that your ruler doesn't read zero!
Keep the displayed reading in mind, or better yet write it down!
Here I am going to measure the height of a brick sitting on my concrete walk.
The reference point for the bottom of the brick is 46.5 cm.
Place the base of your measuring ruler on the point you want everything else to reference from.
This is called your base level or reference level.
Don't worry that your ruler doesn't read zero!
Keep the displayed reading in mind, or better yet write it down!
Here I am going to measure the height of a brick sitting on my concrete walk.
The reference point for the bottom of the brick is 46.5 cm.
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