Nice to see this topic take off as I was thinking about it a week ago

My contribution is to find the scaled relationship between body parts and to remember those in place of or in tandem with their corresponding length, with one being the 'base' of sorts.

Definitely won't be everyone's thing, but I find it reinforces my confidence in my measurements when I can think about either length as absolutes, or in terms of relationships.

I found that this can also be helpful when accuracy is more important.

When I want to use my elbow to fingers, the lifting, moving, placing my arm consecutively until I get my measurements leaves me with uncertainty. If I instead do the length from my thumb to fingertip, I can very easily and quite swiftly keep contact with a surface at all times by moving the further back finger or thumb to meet the leading, freeing the leading finger or thumb to advance forward.