Will it be necessary to measure vertical angles?
For horizontal work only a level instrument will be adequate. If vertical plumbing, aligning or measuring is involved, a level-transit will be required.
How large is your job site?
The answer to this will determine what magnification is required, as well as the diameter-working range required.
What accuracy is needed?
All instruments have accuracy tolerances based on the instrument"s construction, magnification and distance involved. For very precise work, a high-powered instrument may be required even for short-range applications.
Is automatic leveling important?
Automatic levels are easier and faster to set up for leveling, which may be important if you have several setups on one job site.
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