Sorry for the double picture. This is light-weight to be used 1-handed. The fingertips are 1/2" apart. You can see that the blunt end of the "pointer" is 1/2" from the mark. The Pointer assembly with Arm 2 is a slider on the Spine. The wood carving being measured is the right front leg of a 24" green sea turtle. Hollowed on the underside, I wanted to see 3/4" birch wood thickness. Just as easily could have been a stock pot ladel.