How to Use Hand Level : https://www.youtube.com/watch?v=76OHo7HjoBU
The Hand Level : http://www.fao.org/docrep/r7021e/r7021e07.htm#6.4.2 use of the hand level
HAND LEVELS, ABNEY LEVELS, AND DUMPY LEVELS EXPLAINED : http://www.engineersupply.com/Hand-Levels-and-Abney-Levels-and-Dumpy-Levels.aspx

Technical Details

Product Details

Package Dimensions
Width : 2.17 inch
Height : 2.17 inch
Length : 7.68 inch

Shipping Weight: 0 ounce (View shipping rates and policies)

ASIN : B01N2Q4W4W