This standard specifies field procedures to be adopted to assess the uncertainty in the centring of topographic and geodetic instruments, and their ancillary equipment, in any type of surveying measurement, including building and industrial measurements. These instruments include all those that have a plumbing system (plumb bob, optical or laser plummet) to set up on the desired point on the ground materialized by means of a signal, including theodolites, total stations or GNSS receivers. In the case of GNSS receivers, the procedures are applicable as long as the plumbing system is located on the tribrach and this is interchangeable, so that a theodolite or total station can be mounted on it. The procedures are based on the document by García-Balboa et al. (2018). They could also apply a laser scanner, adapting it in a similar way to that described in Tsakiri et al. (2015).