Ophir® Photonics Receives ISO/IEC 17025 Accreditation Ensuring Highest Accuracy NIST-Traceable Measurements from the Company’s Laser Measurement Products

Andover, MA – June 25, 2018 – MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of technologies that enable advanced processes and improve productivity, is pleased to announce that Ophir® Photonics has received ISO/IEC 17025 accreditation for its Jerusalem, Israel Calibration Laboratory. ISO/IEC 17025 is given to calibration laboratories who have achieved the highest standards of quality, administration, and technical operations. The scope of the accreditation covers Ophir’s photodiode, pyroelectric, and thermopile laser power and energy sensors, as well as its power and energy displays and PC interfaces.