International Standard
ISO 17123-2:2001
Optics and optical instruments — Field procedures for testing geodetic and surveying instruments — Part 2: Levels
Reference number
ISO 17123-2:2001
Edition 1
International Standard
Read sample
ISO 17123-2:2001
Published (Edition 1, 2001)
This standard was last reviewed and confirmed in 2021. Therefore this version remains current.

ISO 17123-2:2001

ISO 17123-2:2001
CHF 96
Convert Swiss francs (CHF) to your currency


This part of ISO 17123 specifies field procedures to be adopted when determining and evaluating the precision of

levels (spirit levels, compensator levels, digital levels) and their ancillary equipment when used in building and

surveying measurements. Primarily, these tests are intended to be field verifications of the suitability of a particular

instrument for the immediate task at hand and to satisfy the requirements of other standards. They are not proposed

as tests for acceptance or performance evaluations that are more comprehensive in nature.

This International Standard can be thought of as one of the first steps in the process of evaluating the uncertainty of

a measurement (more specifically a measurand). The uncertainty of a result of a measurement is dependent on a

number of factors. These include among others: repeatability, reproducibility (between day repeatability) and a

thorough assessment of all possible error sources, as prescribed by the ISO Guide to the expression of uncertainty

in measurement (GUM).

These field procedures have been developed specifically for in situ applications without the need for special ancillary

equipment and are purposely designed to minimize atmospheric influences.

General information

  •  : Published
     : 2001-12
    : International Standard confirmed [90.93]
  •  : 1
     : 14
  • ISO/TC 172/SC 6
  • RSS updates

Life cycle

Got a question?

Check out our Help and Support

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)