Above chart is an indispensable visualization tool which will help to illustrate the 'real-world' differences between high and low precision equipments . Being able to understand the inherent errors contained in any particular shot is important . A Level or Theodolite or Total Station's optical tolerance is a critical consideration for machine alignment projects .

This second chart is a rare and very interesting exercise in real-world visualization . It may also provide a useful tool for machine alignments , in the case of that rare time a blueprint provide's a particular angle measurements only .

Visualizing Tolerances

Manufacturers of precision optical equipment will always provide spec sheets indicating exactly what a particular optical product is capable of in terms of arc second accuracies . That info is also available in the unit's user manual .