The Republic of LATVIA Cabinet of 31 august 1998, in Regulation No 334 (in Riga. No 47, § 10.) the state metrological control of measuring instruments subject to list Issued in accordance with the law "on a uniformity of measurements" 8. the second paragraph of article 1, these provisions confirm the state metrological control of a subject-the aim of swallowing the feature list and determining the periodicity of verification.
 
2. the state metrological control of measuring the subject features are as follows:
Measuring means verification p.k.
the name recurrence (not less than) 1 2 3 1.
Geometric size measuring and motion features in 1.1.
leather, fabric and other material length measuring machine 1.2 once a year.
face and tape measures to counterbalance the liquid level measurement in tanks once a year to 1.3.
wood and metal ruler meters and yearly 1.4.
tape every 2 years 1.5.
biezummērītāj (ultrasonic type) 1.6 once a year.
taxi meters once a year 2.
Mass measuring features 2.1.
Libra yearly 2.2.
weights once a year 3.
The strength of the force and the means of measuring 3.1.
material hardness measuring features 3.2 once a year.
Once a year the dynamometer 2.1.
hydraulic presses annually 3.4.
strength of materials testing machines once a year 4.
Pressure and vacuum measuring features 4.1.
pressure gauges, vacuum gauge, manovakuummetr yearly 4.2.
sphygmomanometers (mercury and deformation) every year the 4.3.
traction (gas) the meter once a year 5.
Liquid and gas consumption and volume measuring tools 5.1.
road tankers for the carriage of fuel once a year, 5.2.
road tankers for the carriage of foodstuffs every 2 years 5.3.
differential pressure gauge and diaphragm are annually 5.4.
refuelling machine petrol stations every 6 months 5.5.
fuel and oil filling machine oil bases yearly 5.6.
elektroaspirator, spinners yearly 5.7.
gas consumption meters (municipal) every 15 years, 5.8.
gas consumption meters (industrial) 5.8.1.
Rotary and turbine type once in 8 years 5.8.2.
RS type Rotary RG and every 2 years 5.8.3.
virpuļtip every 2 years to 5.9.
the quantity of milk meters every 2 years, 5.10.
water consumption meters 5.10.1.
without a filter upstream of the meter every 2 years 5.10.2.
with a filter upstream of the meter every 4 years 5.11.
metal measuring cup for petrol stations yearly 5.12.
the measurement of metal food and beverage accounting quantity measuring trade in every 2 years, 5.13.
glass measuring cup to measure the quantity of drinks time after tipping in support of trade-5.14.
containers, food storage every 5 years, 5.15.
self-priming chemical and petroleum product storage every 10 years 6.
Viscosity and density measurement features 6.1.
determinations (glass) every 5 years, 6.2.
determinations (digital) once a year, 6.3.
spirtometr (metal) once a year 7.
Physico-chemical features of measuring magnitude 7.1.
rely on 7.2 every 6 months.
emissions and concentrations of explosive gas analyser yearly 7.3.
wood moisture meter once a year 8.
Temperature measuring features 8.1.
the thermometers every 2 elektrokontakt years 8.2.
the glass thermometers with an interval of up to 0.2 ° C every 2 years 8.3.
the glass thermometers with an interval of 0,5 ° C every 4 years 8.4.
the manometric thermometers 8.5 once a year.
secondary temperature measuring features (bridges, potentiometer, logometr, milivoltmetr), every 2 years, 8.6.
thermoelectric and resistive termopārveidotāj every 2 years to 8.7.
heat meter every 2 years 9.
Optical measurement in physical size features 9.1.
dioptrimetr every 2 years, 9.2.
fotoelektrokolorimetr yearly 9.3.
luksmetr yearly 9.4.
polarimeter yearly 9.5.
Once a year the refractometer 9.6.
UV spectrophotometer 10 once a year.
Acoustic and vibration measurement products 10.1.
audiometr yearly 10.2.
trokšņmēr (complete with filters and pistonfon) once a year, 10.3.
vibrometr once a year 11.
Electric and electromagnetic tools for measuring the size of 11.1.
ampērmetr, voltmetr, Watt for every 2 years, 11.2.
high voltage equipment insulation checking once a year, 11.3.
electricity meter (single-phase) every 12 years, 11.4.
electricity meters (three-phase) every 6 years, 11.5.
Earth gauge (ommetr, megaommetr) once a year, 11.6.
strāvmaiņ, spriegummaiņ, once every 6 years, 11.7.
the electromagnetic field intensity meter once a year 12.
The measurement of time and carry features 12.1.
Stopwatch yearly 12.2.
radar vehicle speed control once a year 13.
Ionizing radiation measuring features 13.1.
dosimeters 13.2 once a year.
radiometer on a yearly 13.3.
spectrometer in the yearly 3. Natural and legal persons shall be drawn up and approved for use in the state metrological control of measuring the subject features list in accordance with paragraph 2 of these regulations and are responsible for compliance with the laws of the list "For unity of measurements".
 
Prime Minister g. Coast Economy Minister l. Strujevič in