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I think once a year is the best. In my country, when working in a project, surveyor always submits the equipment's "Certification for Calibration and Verification" to the Consultant prior to start any activities.
Mind you..
Have your Total Stations calibrated once a year and tribracs calibrated every six months..
(If you utilize conventional survey equipment
on a daily basis.)
Avoid condensation by air open air-rating and towel hand drying after exposed to any precipitation in the field.
Surveying instruments, which include theodolites, levels, total stations, electronic measuring devices, and GPS receivers, are designed and constructed to provide years of reliable use. The shafts, spindles, pendulums, and electronics of precision instruments, although constructed for rugged field conditions, can be damaged by one careless act, or continued inattention to prescribed procedures for use, care, and adjustment of the instrument.
Each new instrument is furnished with an operator's manual. The manual contains a description of the instrument, specifications of its various components and capabilities, and applications. The manual also contains basic instructions for use of the instrument and describes recommended servicing and adjusting methods. The operator's manual should be kept with the instrument at all times. Each operator should thoroughly study the manual prior to use of the instrument, particularly whenever prescribed field adjustments are to be made. If the manual is lost, stolen, or damaged beyond use, a replacement copy should be obtained as soon as practicable.
The following general principles of care and servicing should be applied as a routine matter for all survey equipment and supplies:
Routine Care of Surveying Instruments
Before making the first set up of the day, visually inspect the instrument for cracks, bumps, and dents. Check the machined surfaces and the polished faces of the lenses and mirrors. Try the clamps and motions for smooth operation (absence of binding or gritty sound).
This page has some valuable information as well