This document specifies the measurement of forces by means of load cells carried out for geotechnical monitoring. For measuring forces by means of strain or displacement gauges, see ISO 18674-7. General rules of performance monitoring of the ground, of structures interacting with the ground, of geotechnical fills and of geotechnical works are presented in ISO 18674-1:2015. This document is applicable to: performance monitoring of geotechnical structures such as anchors, end-anchored rock bolts, tiebacks, piles, struts, props and steel linings; checking geotechnical designs and adjustment of construction in connection with the Observational Design procedure; evaluating stability during or after construction. Not subject of this document are devices where the load is purposely applied to geotechnical structures in the wake of geotechnical field tests such as calibrated hydraulic jacks for pull-out tests of anchors or load tests of piles. NOTE This document fulfils the requirements for the performance monitoring of the ground, of structures interacting with the ground and of geotechnical works by the means of load cells as part of the geotechnical investigation and testing in accordance with References [1] and [2].