METROLOGOS ESPECIALIZADOS E INGENIEROS ELÉCTRICOS MEIE S. DE R.L. DE

(A2LA Cert. No. 4853.01) Revised 10/07/2025 Page 2 of 6 Proficiency Testing Programs for the Calibration Area PT Scheme Type of PT Items*** Properties Measured DIMENSIONAL 1D – Portable gauging and hand tools Length – outdoor micrometer calibration (dial indicator; probes)2, 3 Dimensional (length) Indoor and outdoor micrometer calibration (Vernier type meter calibration; vernier caliper ; goniometers); graduated ribbons (graduated rulers), gauge, lever type indicator (stem) 2, 3; portable gauges and hand tools; palpators; ruler; artifacts (size blocks shape – step aligner, distance – taximeter tester); regloscope (lighte bema tilt metest); artifacts; standards and parts; sieve, roughness meter ; tamiz ; ultrasonic thickness gauge Dimensional (length) MECHANICAL Calibration of pressure manometers; pressure relief devices – performance (pressure relief valves; transducers), calibration of transducers (safety valves and boilers), (pressure transducers and sphygmomanometer)2, 3 Pressure Calibration for vacuum gauges; barometers2, 3 Pressure ELECTRICAL Measurement procedures for energy meters (watthourmeters): Calibration by the energy comparison method; calibration by the pulse comparison method; verification of the constant test by the revolution or pulse counting method; verification of the constant test by the energy dosage; start-up test by the revolutions or pulses method; operation without load test in static meters by the pulse count method1, 2, 3 Electrical energy Calibration of instruments transformers of measure voltage and electric current1, 2, 3 Electrical energy, electrical voltage and electrical current Calibration of test equipment for energy meters (EPM)1, 2, 3 Electrical energy, electrical voltage and electrical current Calibration of digital multimeters (from 4 ½ to 6 ½ digits); megohmmeters; voltiamperimetric clamps; calibration of voltage and electrical current sources; ammeter; conductivity (frequency signal in c.a.)2, 3 Voltage in c.c. current in c.c., resistance Ω, voltage in c.a., current in c.a.; capacitance; electric power THERMODYNAMICS Calibration of direct reading thermometers (TLD; TLV; RTD; TRP; infrared and thermocouples, isothermal media in temperature)2, 3, ovens; liquid baths; environmental conditions thermometer, incubators, climatic chambers; temperature simulators; (sensors); liquid baths1, 2, 3, measurement of temperature in tanks (level) Temperature Calibration for thermohygrometers (humidity sensor)2, 3; hygrometers Temperature and relative humidity FORCE Calibration method for torque meters1; brake testers (horizontal forces); impact hammers1, 2, 3, hardness (Vickers) Force MASS AND WEIGHT Calibration of instruments to weigh non-automatic or automatic operation (IPFNA)1; Weight calibration1; vertical force brake testers (suspension analyzer) 1, 2, 3 Mass

(A2LA Cert. No. 4853.01) Revised 10/07/2025 Page 6 of 6 1. Participants come to a central location for calibration or measurement of a single device or item, or for inspection of an installation. 2. A single artefact or device is distributed sequentially to participants. 3. Identical PT items are distributed to participants simultaneously.

For the proficiency testing schemes to which this accreditation applies, please refer to the provider’s Scope of Accreditation. Accredited Proficiency Testing Provider A2LA has accredited METROLOGOS ESPECIALIZADOS E INGENIEROS ELÉCTRICOS MEIE S. DE R.L. DE C.V. Ciudad de México, MEXICO This accreditation covers the specific proficiency testing schemes listed on the agreed upon Scope of Accreditation. This provider is accredited in accordance with the recognized International Standard ISO/IEC 17043: 2023 Conformity assessment - General requirements for proficiency testing. This accreditation demonstrates technical competence for a defined scope and the operation of a quality management system. Presented this 16th day of August 2022 _______________________ Mr. Trace McInturff, Vice President, Accreditation Services For the Accreditation Council Certificate Number 4853.01 Valid to June 30, 2026 Revised October 7, 2025