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Old 06-17-2007, 11:18 AM   #1
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Depth probe tool


i was wondering whether there is a tool that would measure remote depth relative to a level surface ?

e.g. i am digging my basement in segments and i want to make sure that the excavated pit, which extends some 4-5 ft in width, is about 1 ft deep RELATIVE to the old concrete, which may be anywhere from immediate to 4-5 ft away.

i was envisioning a T-square-like contraption whose short arm would be sliding to be able to lower it down until it reaches the bottom while the log arm would resemble a level so that it can be set on a flat surface. the reading on the short arm would then tell you how deep it is and you would move the angle back and forth from the edge of the flat surface to measure depth at different points.

right now, the way i do it i use a 2x4 with a weight pressing it on the level side and measure depth on the cantilever side with a tape measure. i do not really like it as the 2x4 is subject to bending and it is hard to set a right angle with just a tape measure.

IS THERE A TOOL THAT WOULD DO THIS ?

thanks,

- a

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Old 06-17-2007, 12:25 PM   #2
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Depth probe tool


Sounds like you need a transit....

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Old 06-17-2007, 02:51 PM   #3
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Depth probe tool


what do you mean by 'transit' ?
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Old 06-17-2007, 06:04 PM   #4
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Depth probe tool


You could use a laser level. Available on Amazon and a variety of local and internet stores.
Ron
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Old 06-17-2007, 06:09 PM   #5
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Depth probe tool


Transit in basic would be a sight level mounted on a tripod... Its set in one place in the basment and plumbed. Then a rod with graduations on it [like a big measuring stick] is viewed thru the sight at various points around the basement to determine differences in elevation. In your case at the top of the hole your digging and the botom of the hole.
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Old 06-19-2007, 03:30 PM   #6
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Depth probe tool


DIY solution, get a plumb bob and tie some non stretchy white string to it. With a permanent marker, mark increments like every foot, etc. Cantilever a straight 2x out from the old slab, level and weight the end on the slab. Get a ladder in the hole and hang the plumb bob down and read your hash marks. good luck

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