It's all academic really. Once you have done your testing you should have everything nailed down for the film/devloper/paper combinations you use. It doesn't really matter if my meter reads the same as yours etc. It only matters that I know how mine reacts to various lighting situations and I can apply the appropriate adjustments to the "suggested" exposure to obtain my pre-visualized image in the darkroom. I prefer not to trip over the roots so I can at least get to the forest, so I can photograph the tree.