Certificate of Accreditation

PERRY JOHNSON LABORATORY ACCREDITATION, INC. Certificate of Accreditation Perry Johnson Laboratory Accreditation, Inc. has assessed the Laboratory of: Hardt Calibration Laboratory S. de R.L. de C.V., (Hereinafter called the Organization) and hereby declares that Organization is accredited in accordance with the recognized International Standard: ISO/IEC 17025:2005 This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (as outlined by the joint ISO-ILAC-IAF Communiqué dated January 2009): Mechanical, Electrical, Dimensional, Time and Frequency, Mass, Force and Weighing Devices, Thermodynamic and Chemical Calibration (As detailed in the supplement) Accreditation claims for such testing and/or calibration services shall only be made from addresses referenced within this certificate. This Accreditation is granted subject to the system rules governing the Accreditation referred to above, and the Organization hereby covenants with the Accreditation body s duty to observe and comply with the said rules. For PJLA: Initial Accreditation Date: Issue Date: Expiration Date: Tracy Szerszen President/Operations Manager Perry Johnson Laboratory Accreditation, Inc. (PJLA) 755 W. Big Beaver, Suite 1325 Troy, Michigan 48084 May 13, 2010 April 04, 2017 April 04, 2019 Accreditation No.: Certificate No.: 50911 L17-126 The validity of this certificate is maintained through ongoing assessments based on a continuous accreditation cycle. The validity of this certificate should be confirmed through the PJLA website: www.pjlabs.com Page 1 of 12

Mechanical DEVICE SIZE AS AND Preassure Gauges FO 50 psi to 500 psi 0.89 psi Digital Pressure Gage BETA GAUGE P.I. PRO Ametek T-975 Vacuum Gauges FO -25 inhg to -3 inhg 1.1 inhg Vacuum Gage USG 0 to 30 inhg Ametek T-750 Force Gage FO 5 kn to 45 kn 1 % of reading Trasducer Techniques, LBC-10 K Torques Gage FO 5.6 N m to 56 N m 1 % of reading Trasducer Techniques, TRT-500 Load Cell Compression FO 100 lb to 10 000 lb (3.06 + 7.8 x 10-4 Wt) lb Transducer Techniques, LWO- 20 Torque Analyzer F 10 N to 100 N 0.5 % of reading Weight class 4. Wheel of 4 in Diameter Indirect Verification of 20 HRC to 39 HRC 0.37 HRC Rockwell Test Block Rockwell Hardness Machines 40 HRC to 59 HRC 0.35 HRC HRC O 60 HRC to 70 HRC 0.32 HRC Humid Gasometer FO 0.5 L/min to 40 L/min 1.8 % of reading Analytic Balance AND 0 gr to 12 000 gr Gravimetric method Flow Meters 0.1 L/min to 40 L/min 4.6 % of reading Dry Test Meter Rotameters F Dry Gas Meters F (Calibration Factor) DTM-200A 1 L/min to 40 L/min 4.8 % of reading Humid Gasometer Elster, AL-19-3 Consoles F (γ, Ha) (Isometric Factor) (Calibration Factor) 1 L/min to 40 L/min 4.4 % of reading Humid Gasometer Elster, AL-19-3 High Volumen F 100 L/min to 2 600 L/min 0.55 % of reading Rotary Meter Elster, G100 Piston Pipettes F 10 µl to 500 µl 0.62 % of reading Analytic Balance OHAUS, 1 ml to 10 ml 0.45 % of reading DV215CD / 0 gr to 81 gr Test Tubes F 5 ml to 50 ml 0.42 % of reading Analytic Balance OHAUS, 100 ml to 200 ml 0.21 % of reading DV215CD / 81 gr to 210 gr Pycnometers F 10 ml to 100 ml 0.42 % of reading Analytic Balance OHAUS, DV215CD / 81 gr to 210 gr Burettes F 5 ml to 50 ml 0.16 % of reading Analytic Balance OHAUS, DV215CD / 0 gr to 81 gr Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 2 of 12

Mechanical Certificate of Accreditation: Supplement DEVICE SIZE AS AND CAPABILITY EXPRESSED Beakers: Container F 10 ml to 200 ml 0.21 % of reading Analytic Balance OHAUS, DV215CD / 0 gr to 81 gr Probes F 1 ml to 100 ml 1.2 % of reading Analytic Balance OHAUS, DV215CD / 0 gr to 81 gr 500 ml to 2 000 ml 0.59 % of reading Analytic Balance AND, 0 gr to 12 000 gr Simple Delivery Piston Dispensers F Volumetric Measures with Graduated Neck F Volumetric Measures with Graduated Neck to Deliver F Chemical 1 ml to 200 ml 0.23 % of reading Analytic Balance OHAUS, DV215CD / 0 gr to 81 gr 2 L to 10 L 0.12% of reading Analytic Balance AND, 0 gr to 12 000 gr 2 L to 10 L 0.12 % of reading Analytic Balance AND, 0 gr to 12 000 gr DEVICE SIZE AS AND ph Meters FO 4 ph to 10 ph 0.11 ph Fermont, ph Buffer Solution (4, 6.86, 7, 10 ph Units) Conductivity Meters FO 1 413 µs/cm 5.6 µs/cm Hanna Instrument, Conductivity Solution, HI7031L/C Mass, Force, and Weighing Devices AND Scales and Balances O 1 g to 100 g (2.27 x 10-2 + 2.73 x 10-4 Wt) g Class 1 Weights 100 g to 500 g (7.22 x 10-2 + 4.8 x 10-5 Wt) g Class 4 Weights 500 g to 1 kg (1.35 x 10-1 + 4 x 10-5 Wt) g 1 kg to 5 kg (1.13 x 10-1 + 4.7 x 10-5 Wt) g 5 kg to 10 kg (3.04 x 10-1 + 1.8 x 10-5 Wt) g 10 kg to 25 kg (1.83 + 1.4 x 10-5 Wt) g Handbook 44 25 kg to 250 kg (7.02 x 10-2 + 4.76 x 10-4 Wt) kg Verification with Class F Weights 250 kg to 2 500 kg (3.45 x 10-1 + 2.84 x 10-4 Wt) kg Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 3 of 12

Electrical Temperature Calibration Indication, and Control Equipment used With Thermocouples Type J FO Temperature Calibration Indication, and Control Equipment used With Thermocouples Type K FO DC Current FO AND -210 C to -100 C 0.27 C Electrical Simulation of -99 C to -30 C 0.17 C Thermocouple Output Fluke 5500A -29 C to 150 C 0.15 C 151 C to 760 C 0.19 C 761 C to 1 200 C 0.23 C -200 C to -100 C 0.35 C -99 C to -25 C 0.21 C -24 C to 120 C 0.19 C 121 C to 1 000 C 0.28 C 1 001 C to 1 372 C 0.32 C 0.18 µa to 999 µa 0.004 1 % of reading Fluke 5500A 1 ma to 999 ma 0.027 % of reading 1 A to 15 A 0.25 % of reading + 0.002 A Fluke 5500A with 15 A to 150 A 0.25 % of reading + 0.015 A 5500A/COIL 150 A to 550 A 0.25 % of reading + 0.05 A AC Current At the listed frequencies FO 10 Hz to 20 Hz 0.18 µa to 100 μa 4 na/µa + 30 na 20 Hz to 45 Hz 0.18 µa to 100 μa 1.5 na/µa + 30 na 45 Hz to 100 Hz 0.18 µa to 100 μa 0.6 na/µa + 30 na 100 Hz to 1 khz 0.18 µa to 100 μa 0.6 na/µa + 30 na AC Current At the listed frequencies FO 10 Hz to 20 Hz 0.18 ma to 1 ma 4 µa/ma + 200 na 20 Hz to 45 Hz 0.18 ma to 1 ma 1.5 µa/ma + 200 na 45 Hz to 100 Hz 0.18 ma to 1 ma 0.6 µa/ma + 200 na 100 Hz to 5 khz 0.18 ma to 1 ma 0.3 µa/ma + 200 na 5 khz to 20 khz 0.18 ma to 1 ma 0.6 µa/ma + 200 na 20 khz to 50 khz 0.18 ma to 1 ma 4 µa/ma + 400 na 50 khz to 100 khz 0.18 ma to 1 ma 5.5 µa/ma + 1 500 na Fluke 5500A Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 4 of 12

Electrical AC Current At the listed frequencies FO Certificate of Accreditation: Supplement AND 10 Hz to 20 Hz 0.18 ma to 10 ma 4 µa/ma + 2 µa 20 Hz to 45 Hz 0.18 ma to 10 ma 1.5 µa/ma + 2 µa 45 Hz to 100 Hz 0.18 ma to 10 ma 0.6 µa/ma + 2 µa 100 Hz to 5 khz 0.18 ma to 10 ma 0.3 µa/ma + 2 µa 5 khz to 20 khz 0.18 ma to 10 ma 0.6 µa/ma + 2 µa 20 khz to 50 khz 0.18 ma to 10 ma 4 µa/ma + 4 µa 50 khz to 100 khz 0.18 ma to 10 ma 5.5 µa/ma + 15 µa AC Current At the listed frequencies FO 10 Hz to 20 Hz 0.18 ma to 100 ma 4 µa/ma + 20 µa 20 Hz to 45 Hz 0.18 ma to 100 ma 1.5 µa/ma + 20 µa 45 Hz to 100 Hz 0.18 ma to 100 ma 0.6 µa/ma + 20 µa 100 Hz to 5 khz 0.18 ma to 100 ma 0.3 µa/ma + 20 µa 5 khz to 20 khz 0.18 ma to 100 ma 0.6 µa/ma + 20 µa 20 khz to 50 khz 0.18 ma to 100 ma 4 µa/ma + 40 µa 50 khz to 100 khz 0.18 ma to 100 ma 5.5 µa/ma + 150 µa AC Current At the listed frequencies FO 10 Hz to 20 Hz 0.18 A to 1 A 4 ma/a + 0.2 ma 20 Hz to 45 Hz 0.18 A to 1 A 1.6 ma/a + 0.2 ma 45 Hz to 100 Hz 0.18 A to 1 A 0.8 ma/a + 0.2 ma 100 Hz to 5 khz 0.18 A to 1 A 1 ma/a + 0.2 ma 5 khz to 20 khz 0.18 A to 1 A 3 ma/a + 0.2 ma 20 khz to 50 khz 0.18 A to 1 A 10 ma/a + 0.4 ma Fluke 5500A 45 Hz to 65 Hz 1 A to 15 A 0.28 % of reading + 0.003 A Fluke 5500A with 1 A to 150 A 0.28 % of reading + 0.025 A 5500A/COIL 150 A to 550 A 0.28 % of reading + 0.09 A 65 Hz to 440 Hz 2 A to 15 A 0.79 % of reading + 0.003 A 2 A to 150 A 0.79 % of reading + 0.027 A 151 A to 550 A 0.79 % of reading + 0.1 A Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 5 of 12

Electrical Resistance FO DEVICE SIZE AS AND 0.017 Ω to 10 15 µ / + 50 µ Fluke 5500A 10 Ω to 100 12 µ / + 500 µ 100 Ω to 1 k 10 µ / + 500 µ 1 k to 10 k 10 µ / + 5 m 10 k to 100 k 10 µ / + 50 m 100 k to 1 M 15 µ / + 2 1 M to 10 M 50 µ / + 1 10 M to 100 M 500 µ / + 10 100 M to 1 G 5 000 µ / + 100 AC Voltage At the listed frequencies FO 1 Hz to 50 khz 0 mv to 100 mv 0.2 % of reading 50 khz to 4 MHz 10 mv to 100 mv 0.2 % of reading 1 Hz to 300 khz 10 mv to 100 mv 0.5 % of reading 1 Hz to 2 MHz 100 mv to 10 V 0.8 % of reading 1 Hz to 50 khz 100 V to 700 V 0.6 % of reading 50 khz to 100 khz 100 v to 1 000 V 0.6 % of reading DC Voltage FO DC Current FO Resistance FO HP 3458A 0.003 6 mv to 239.999 9 mv 60 μv/v + 3 μv Fluke 5500A 0.003 6 V to 3.299 999 V 50 μv/v + 5 µv 0.003 6 V to 32.999 99 V 50 μv/v + 50 μv 30 V to 329.999 9 V 55 μv/v + 500 μv 100 V to 1 020 V 55 μv/v + 1 500 μv 0.18 ma to 3.299 99 ma 130 μa/a + 0.05 μa 0.18 ma to 32.99 99 ma 100 μa/a + 0.25 μa 0.18 ma to 329.999 ma 100 μa/a + 3.3 μa 0.18 A to 2.199 99 A 300 μa/a + 44 μa 0.18 A to 11 A 600 μa/a + 330 µa 0 Ω to 10.99 Ω 120 μω/ω + 0.008 Ω 11 Ω to 32.999 Ω 120 μω/ω + 0.015 Ω 33 Ω to 109.999 Ω 90 μω/ω + 0.015 Ω 110 Ω to 329.99 9 Ω 90 μω/ω + 0.015 Ω 330 Ω to 1.099 99 kω 90 μω/ω + 0.06 Ω Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 6 of 12

Electrical Resistance FO AND 1.1 kω to 3.299 99 kω 90 μω/ω + 0.06 Ω Fluke 5500A 3.3 kω to 10.999 9 kω 90 μω/ω + 0.6 Ω 11 kω to 32.999 9 kω 90 μω/ω + 0.6 Ω 33 kω to 109.999 kω 110 μω/ω + 6 Ω 110 kω to 329.999 kω 120 μω/ω + 6 Ω 330 kω to 1.099 99 MΩ 150 μω/ω + 55 Ω 1.1 MΩ to 3.299 99 MΩ 150 μω/ω + 55 Ω 3.3 MΩ to 10.999 9 MΩ 600 μω/ω + 0.55 kω 11 MΩ to 32.999 9 MΩ 1 000 μω/ω + 0.55 kω 33 MΩ to 109.999 MΩ 5 000 μω/ω + 5.5 kω 110 MΩ to 330 MΩ 5 000 μω/ω + 16.5 kω AC Voltage At the listed Frequencies FO 10 Hz to 45 Hz 1 mv to 32.999 mv 0.35 % of reading + 20 µv 45 Hz to 10 khz 1 mv to 32.999 mv 0.15 % of reading + 20 µv 10 khz to 20 khz 1 mv to 32.999 mv 0.2 % of reading + 20 µv 20 khz to 50 khz 1 mv to 32.999 mv 0.25 % of reading + 20 µv 50 khz to 100 khz 1 mv to 32.999 mv 0.35 % of reading + 33 µv 100 khz to 500 khz 1 mv to 32.999 mv 1 % of reading + 60 µv AC Voltage at the listed Frequencies FO 10 Hz to 45 Hz 33 mv to 329.999 mv 0.25 % of reading + 50 µv 45 Hz to 10 khz 33 mv to 329.999 mv 0.05 % of reading + 20 µv 10 khz to 20 khz 33 mv to 329.999 mv 0.1 % of reading + 20 µv 20 khz to 50 khz 33 mv to 329.999 mv 0.16 % of reading + 40 µv 50 khz to 100 khz 33 mv to 329.999 mv 0.24 % of reading + 170 µv 100 khz to 500 khz 33 mv to 329.999 mv 0.7 % of reading + 330 µv Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 7 of 12

Electrical ) AND AC Voltage at the listed Frequencies FO 10 Hz to 45 Hz 330 mv to 3.29 V 0.2 % of reading 60 + 250 µv 45 Hz to 10 khz 330 mv to 3.29 V 0.03 % of reading + 60 µv 10 khz to 20 khz 330 mv to 3.29 V 0.08 % of reading + 60 µv 20 khz to 50 khz 330 mv to 3.29 V 0.14 % of reading + 300 µv 50 khz to 100 khz 330 mv to 3.29 V 0.24 % of reading + 1 700 µv 100 khz to 500 khz 330 mv to 3.29 V 0.5 % of reading + 3 300 µv AC Voltage at the listed Frequencies FO 10 Hz to 45 Hz 3.3 V to 32.99 V 0.15 % of reading + 2 500 µv 45 Hz to 10 khz 3.3 V to 32.99 V 0.04 % of reading + 600 µv 10 khz to 20 khz 3.3 V to 32.99 V 0.08 % of reading + 2 600 µv 20 khz to 50 khz 3.3 V to 32.99 V 0.19 % of reading + 5 000 µv 50 khz to 100 khz 3.3 V to 32.99 V 0.24 % of reading + 17 000 µv AC Voltage at the listed Frequencies FO 45 Hz to 1 khz 33 V to 329.99 V 0.05 % of reading + 6.6 mv 1 khz to 10 khz 33 V to 329.99 V 0.08 % of reading + 15 mv 10 khz to 20 khz 33 V to 329.99 V 0.09 % of reading + 33 mv RTD Pt 350, 100 FO RTD Pt 385, 200 FO Fluke 5500A 200 C to -80 ºC 0.05 ºC Fluke 5500A 0 C to 100 ºC 0.07 ºC Electrical Simulation of RTD Output 100 C to 300 ºC 0.09 ºC 300 C to 400 ºC 0.10 ºC 400 C to 630 ºC 0.12 ºC 630 C to 800 ºC 0.23 ºC -200 C to -80 ºC 0.04 ºC 100 C to 260 ºC 0.05 ºC 260 C to 300 ºC 0.12 ºC Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 8 of 12

Electrical RTD Pt 385, 200 FO RTD Pt 385, 500 FO RTD Pt 385, 1 000 FO RTD Pt 3929, 100 FO RTD Pt 3916, 100 FO RTD PtNl 385,120 FO AND 300 C to 400 ºC 0.13 ºC Fluke 5500A 400 C to 600 ºC 0.14 ºC 600 C to 630 ºC 0.16 ºC -200 C to -80 ºC 0.04 ºC -80 C to 0ºC 0.05 ºC 100 C to 260 ºC 0.06 ºC 260 C to 300 ºC 0.08 ºC 300 C to 400 ºC 0.08 ºC 400 C to 600 ºC 0.09 ºC 600 C to 630 ºC 0.11 ºC -200 C to -80 ºC 0.03 ºC 0 C to 100 ºC 0.04 ºC 100 C to 260 ºC 0.05 ºC 260 C to 300 ºC 0.06 ºC 300 C to 400 ºC 0.07 ºC 400 C to 630 ºC 0.23 ºC Electrical Simulation of RTD Output -200 C to 0 ºC 0.05 ºC Fluke 5500A 0 C to 100 ºC 0.07 ºC Electrical Simulation of RTD Output 100 C to 260 ºC 0.09 ºC 260 C to 300 ºC 0.10 ºC 400 C to 630 ºC 0.12 ºC -200 C to -190 ºC 0.25 ºC -190 C to -80 ºC 0.04 ºC -80 C to 0 ºC 0.05 ºC 0 C to 100 ºC 0.06 ºC 100 C to 260 ºC 0.07 ºC 260 C to 300 ºC 0.08 ºC 300 C to 400 ºC 0.09 ºC 400 C to 600 ºC 0.10 ºC -80 C to 100 C 0.08 C -100 C to 260 C 0.3 C Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 9 of 12

Thermodynamic AND Thermal Chamber O 200 ºC to 600 ºC 1.8 ºC Fluke 51 II Thermocouple Type K Thermal Oven O -65 ºC to 1 200 ºC 1.8 ºC Fluke 5500A Thermocouple Type K Thermal Controllers FO 40 C to 1760 ºC 2 ºC Fluke 5500 A Thermocouple Type J, K Hygrometers FO 10 % RH to 90 % RH 3.2 % RH Thermo Hygrometer DT-321S Humidity Chamber O 10 % RH to 90 % RH 3.4 % RH Thermo Hygrometer DT-321S Dimensional AND Vernier Calipers F 0.5 mm to 300 mm 28 µm Gage Blocks Micrometers FO 0.5 mm to 25 mm 7 µm Optical Comparators Length O Optical Comparators Angularity O Optical Comparators Squareness O Optical Comparators Magnification O Measuring Machine Coordinate CMM Performance O 0.5 mm to 300 mm 20 µm Glass Scale Length 0 to 90 0.02 Deltronic Slide Optical 110 mm x 90 mm 21 µm Square Master 10X 20X 30X 0.17 % 0.34 % 0.51 % Amplification Scale 25 mm to 1 350 mm (0.95 + 5 x 10-4 L) µm Block Gage ASME, Master Ball Bar B89.4.10360.2:2008 ISO 10360-2:2009 Measuring Machine Coordinate Repeatability O 25 mm (1 in) 2.4 µm (94 µin) Master Ball Bar ASME B89.4.10360.2:2008 ISO 10360-2:2009 Quik Scope, Micro Viu O 0.5 mm to 300 mm 17 µm Glass Scale Length Dial Thickness Gage F 0.05 mm to 2 mm (15.24 + 0.01L) µm Master Gage Block Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 10 of 12

Dimensional AND Gage Blocks F 0.5 mm to 100 mm 3.3 µm Blanchet comparator with Master Gage Block, Mitutoyo, Grade 1 Steel Ruler F 5 mm to 1 000 mm 1.3 mm Master Gage Block Height Gage F 45.75 µm to 600 mm (15.24 + 0.01L) µm Lainas de espesor, Master Gage Blocks Pin Gages F 0.5 mm to 50 mm 2.2 µm Micrometer APB 3D Surface Plate O Repeat measurement 0.002 in 80 µin Thickness Sensor (Electronic, Ultrasonic) FO JIS B 7513 Repeat-o- Meter 21 µm to 150 mm 7 µm Master Gage Block Plain Plug Gage F 0.25 mm to 25 mm 7 µm Micrometer Time and Frequency AND Chronometers FO 86 400 s 5.4 s Digital Stopwatch 1. The CMC (Calibration and Measurement Capability) stated for calibrations included on this scope of accreditation represents the smallest measurement uncertainty attainable by the laboratory when performing a more or less routine calibration of a nearly ideal device under nearly ideal conditions. It is typically expressed at a confidence level of 95 % using a coverage factor k (usually equal to 2). The actual measurement uncertainty associated with a specific calibration performed by the laboratory will typically be larger than the CMC for the same calibration since capability and performance of the device being calibrated and the conditions related to the calibration may reasonably be expected to deviate from ideal to some degree. 2. The laboratories range of calibration capability for all disciplines for which they are accredited is the interval from the smallest calibrated standard to the largest calibrated standard used in performing the calibration. The low end of this range must be an attainable value for which the laboratory has or has access to the standard referenced. Verification of an indicated value of zero in the absence of a standard is common practice in the procedure for many calibrations but by its definition it does not constitute calibration of zero capacity 3. Measurement uncertainties obtained for calibrations performed at customer sites can be expected to be larger than the measurement uncertainties obtained at the laboratories fixed location for similar calibrations. This is due to the effects of transportation of the standards and equipment and upon environmental conditions at the customer site which are typically not controlled as closely as at the laboratories fixed location. Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 11 of 12

4. The presence of a superscript FO means that the laboratory performs calibration of the indicated parameter both at its fixed location and onsite at customer locations. Example: Outside Micrometer FO would mean that the laboratory performs this calibration at its fixed location and onsite at customer locations. 5. The term L represents length in inches or millimeters as appropriate to the uncertainty statement. 6. The term Wt represents weight in pounds or grams (including SI multiple and submultiple units) appropriate to the uncertainty statement. Issue 04/2017 This supplement is in conjunction with certificate # L17-126 Page 12 of 12