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1- Always perform the Reference Measurement Protocol at each scene.
The definition of the Reference Measurement Protocol is two (2) independent 'shots' taken to a known distance, using conventional hand-measuring tools, to verify the Instruments ability to measure a distance and two-angles.
2- If using a Total Station's Red laser Dot for Aiming Purposes to Evidence Points, always check the alignment of the reticle cross-hair of the Instrument against a reflective, independent "target" point.
Test targets are available commercially. Some manufactures provide them.
3- Always use a Electronic Total Station that has a minimum of a Single-Axis Compensator.
Most Total Stations in use today come standard with a Dual-Axis Compensator.