Construction and operation of measuring instrumentsancillary deviceassociated measuring instrumentchecking facilitycontrol instrumentdisturbancedurabilitydurability errordurability testfaultfault limitindicating deviceinfluence factorinitial intrinsic errornumber of verification scale intervalsperformance testprimary indicationscale intervalsignificant durability errorsignificant faultterminaltest programverification scale intervalVIML