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On the unity of measurements https://likumi.lv/doc.php?id=42562

Cabinet Regulation No. 40 Regulations on the List of Measuring Instruments Subject to State Metrological Control ", with amendments http://likumi.lv/doc.php?id=151306

Cabinet Regulation No. 212 Metrological requirements for measuring instruments and the procedure for their metrological control https://likumi.lv/ta/id/281520-merisanas-lidzeklu-metrologiskas-prasibas-un-to-metrologiskas-kontroles-kartiba

Cabinet Regulation No. 624 Regulations on the Procedure for Metrological Control of Measuring Instruments and Marks for Initial Verification https://likumi.lv/ta/id/269947

Cabinet Regulation No. 664 Regulations on Metrological Requirements for Water Consumption Meters http://likumi.lv/doc.php?id=142369&from=off

Cabinet Regulation No. 667 Regulations on Metrological Requirements for Heat Meters http://likumi.lv/doc.php?mode=DOC&id=142371

Cabinet Regulation No. 981 Regulations on Re-Verification of Measuring Instruments, Verification Certificates and Verification Marks http://likumi.lv/doc.php?id=149301