Merrimac Fourth Quarter and Fiscal Year 2003 Financial Results and Conference Call Information

WEST CALDWELL, N.J., March 31, 2004: Merrimac Industries, Inc. (AMEX: MRM), a leader in the design and manufacture of RF Microwave components, assemblies and micro-multifunction modules (MMFM®), today announced plans to release its fourth quarter and fiscal year 2003 financial results after the market closes on Thursday, April 1, 2004.

Investors are invited to participate in the financial results conference call on Thursday April 1, 2004 at 4:30 p.m. (Eastern) by dialing 1-800-915-4836 (for International callers: 1-973-317-5319) ten minutes prior to the scheduled start time, and reference the Merrimac Industries fourth quarter 2003 conference call. For those unable to participate, a replay will be available for seven days by dialing 1-800-428-6051, or 1-973-709-2089 for international callers, passcode number 348168.

This conference call will also be broadcast live over the internet by logging on to the web at this address:

http://www.firstcallevents.com/service/ajwz403089094gf12.html

If you are unable to participate during the live webcast, a link to the archived webcast will be listed on the Merrimac Industries, Inc. website.
http://www.merrimacind.com

About Merrimac

Merrimac Industries, Inc. is a leader in the design and manufacture of Multi-Mix PICO™ RF Microwave components, assemblies and micro-multifunction modules (MMFM), serving the wireless telecommunications industry worldwide with enabling technologies for space, defense and commercial applications. Merrimac is focused on providing Total Integrated Packaging Solutions® with Multi-Mix® Microtechnology, a leading edge competency providing value to our customers through miniaturization and integration. The Multi-Mix® process for microwave, multilayer integrated MMFM circuitry is a patented method developed by Merrimac Industries based on fluoropolymer composite substrates. The fusion bonding of multilayer structures provides a homogeneous dielectric medium for superior electrical performance at microwave frequencies. The bonded layers may incorporate embedded semiconductor devices, MMICs, etched resistors, passive circuit elements and plated-through via holes to form a three-dimensional subsystem enclosure that requires no further packaging. Merrimac Industries facilities are registered under ISO 9000, an internationally developed set of quality criteria for manufacturing operations.

Merrimac Industries, Inc. and its subsidiary Filtran Microcircuits Inc., are located in West Caldwell, NJ, San Jose, Costa Rica and Ottawa, Ontario, Canada, and have approximately 210 co-workers dedicated to the design and manufacture of signal processing components, gold plating of high-frequency microstrip, bonded stripline and thick metal-backed Teflon (PTFE) micro-circuitry and subsystems providing Total Integrated Packaging Solutions® for wireless applications. Merrimac (MRM) is listed on the American Stock Exchange. Multi-Mix®, Multi-Mix PICO™, MMFM® and Total Integrated Packaging Solutions® are trademarks of Merrimac Industries, Inc. For more information about Merrimac Industries, Inc. and Filtran Microcircuits Inc., please visit http://www.merrimacind.com and http://www.filtranmicro.com.

Note: Merrimac news releases are also available on the Internet at: http://www.prnewswire.com.

Contact:

Mason N. Carter, Chairman & CEO
973.575.1300, ext. 1202
E-mail: mnc@merrimacind.com