This product seems to be light considering that it is used in the field. I had to drive 50 stakes into the ground, but I don't do that often. Those levels have done their job. The magnets are weak and won't stick to a dirty post, but the straps did the job. Levels were accurate and consistent. If I did this for a living I would find a cruder product but for limited use they are good enough and at a great price.