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Tool - Plumb Bob

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Plumb Bob 

Typical plumb bobs are 8 oz or 16 oz.  The best choice is 8 oz because the 16 oz ones hang too heavily on the cross strings which causes then to sag down and therefore give an error.  Any lighter than 8 oz and it won't keep the vertical string tight enough.

8 oz ones are available for about $10 in your local home center or from:

http://www.homedepot.com/Energy-Star/Tools-Hardware-Hand-Tools/h_d1/N-5yc1vZ1xg1Zas71Z1z141o3/R-100113390/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053

 

Having one 16 oz one can be useful for one off use down high walls.

16 oz ones are available for about $13 from:

http://www.antonline.com/p_Stanley--47-974--Stanley-47-974-16-oz-Brass-Plumb-Bob-_342898.htm

http://www.antonline.com/p_Empire-Level--916BR--Empire-Level-916BR-16-Ounce-Brass-Plumb-Bob-_655742.htm