Nev. Admin. Code § 581.350
The standards used by a service agency or serviceperson to repair or adjust a weighing or measuring device must be certified by a laboratory that has been qualified by the National Institute of Standards and Technology to certify such standards or the State Sealer of Measurement Standards according to the following schedule:
Standards for measuring mass ........................................................... | Every 2 years |
Handheld or portable standards for measuring volume from 1 gallon up to 5 gallons......................................... | Annually |
Mounted standards for proving volume from 5 gallons up to 100 gallons ............................................................. | Every 2 years |
Mounted standards for proving volume from 101 gallons up to 1000 gallons ................................................................................. | Every 4 years |
Any other standards .......................................................................... | As prescribed by the State Sealer of Measurement Standards |
Nev. Admin. Code § 581.350
NRS 581.050 and 581.067