This standard specifies the sizes and performance requirements for both precise and coarse vials for spirit levels. The vials are for use in instruments for precision surveying, inspection, and general levelling. Ranges for the parameters of spirit level vials are related to the sensitivity of the vial, and preferred sets of parameters for given sensitivities are indicated.
NOTES:
1. Appendix A gives recommended methods of testing vials.
2. Appendix B gives recommendations for standard mounts for vials.
