ESI Schedules Fiscal 2010 Q2 Earnings Release and Conference Call for Wednesday, October 21

Electro Scientific Industries, Inc. (Nasdaq: ESIO), a leading provider of world-class photonic and laser systems for microengineering applications, today announced that it will release results for its fiscal 2010 second quarter after the market closes on Wednesday, October 21, 2009. Following the announcement, Nick Konidaris, chief executive officer, will host a conference call at 2:00 p.m. Pacific Time to discuss the company’s results along with business highlights and outlook. The conference call will also be simultaneously webcast, and can be accessed at www.esi.com.

What: ESI Fiscal 2010 Q2 Earnings Conference Call

When: Wednesday, October 21, 2009 at 2:00 p.m. (Pacific Time).

How: Live call participants can dial 888-419-5570 (domestic) or 617-896-9871 (international) and use passcode 12639188.

Webcast: www.esi.com

Replay: At the call’s completion, an audio replay will be available at www.esi.com or by calling 888-286-8010 (domestic) or 617-801-6888 (international) and using passcode 35092699. The phone replay will be available through October 31, 2009.

About ESI, Inc.

ESI is a pioneer and leading supplier of world-class production laser systems that help its microelectronics customers achieve compelling yield and productivity gains. The company’s industry-leading, application-specific products enhance electronic-device performance in three key sectors—semiconductors, components and electronic interconnect—by enabling precision fine-tuning of device microfeatures in high-volume manufacturing environments. Founded in 1944, ESI is headquartered in Portland, Ore. More information is available at www.esi.com.