CERTIFICATE Certificate Number: 142237.02 The Environmental Management System and implementation of:

Keithley Instruments, LLC A Tektronix Company 28775 Aurora Road, Cleveland, OH 44139 United States meets the requirements of the standard:

ISO 14001:2015 Certification Structure: Single Scope: Environmental activities related to design, marketing, manufacture, calibration, and service of measurement, test and monitoring products. Extended Expiration Date: February 10, 2021 Original Expiration Date: September 10, 2020 Certificate Reissued: September 01, 2020 Certificate Issued: September 11, 2017 Certified Since: September 11, 2014

Dr. Cem O. Onus Managing Director DEKRA Certification, Inc. 1120 Welsh Road, Suite 210 North Wales, PA 19454 USA (215) 997-4519 www.dekra.us/en/audits