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2. Water metering - Wikipedia

   en.wikipedia.org/wiki/Water_metering

   A typical water meter register showing a meter reading of 8.3 gallons. Notice the black "1" on the odometer has not yet fully turned over, so only the red hand is read. Water meters connected to remote reading devices through three-wire cables. There are several types of registers on water meters.

3. Measuring Instruments Directive - Wikipedia

   en.wikipedia.org/wiki/Measuring_Instruments...

   The MID covers these measuring instruments: Water meters; Gas meters and volume conversion devices; Active electrical energy meters; Heat meters; Measuring systems for the continuous and dynamic measurement of quantities of liquids other than water

4. Certified reference materials - Wikipedia

   en.wikipedia.org/wiki/Certified_reference_materials

   Since most analytical instrumentation is comparative, it requires a sample of known composition (reference material) for accurate calibration. These reference materials are produced under stringent manufacturing procedures and differ from laboratory reagents in their certification and the traceability of the data provided.

5. ISO/IEC 17025 - Wikipedia

   en.wikipedia.org/wiki/ISO/IEC_17025

   ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories is the main standard used by testing and calibration laboratories. In most countries, ISO/IEC 17025 is the standard for which most labs must hold accreditation in order to be deemed technically competent.

6. National Accreditation Board for Testing and Calibration ...

   en.wikipedia.org/wiki/National_Accreditation...

   National Accreditation Board for Testing and Calibration Laboratories (NABL) provides accreditation to Conformity Assessment Bodies (Laboratories) in India.NABL Schemes include Accreditation (Recognition) of Technical competence of testing, calibration, medical testing laboratories, Proficiency testing providers (PTP) & Reference Material Producers (RMP) for a specific scope following ISO/IEC ...

7. Calibration - Wikipedia

   en.wikipedia.org/wiki/Calibration

   The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the following: "Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or ...