Released Products with Masimo SET technology: ALARIS Medical Systems, Inc. 10221 Wateridge Circle San Diego, CA. 92121-2733 USA (858) 458-7000 (858) 458-7760 Fax Medley™ Medication Safety System SpO2 Module www.alarismed.com ALARIS Medical Will Incorporate Masimo SET® Pulse Oximetry into its First Generation Modular Patient Care System SAN DIEGO, CA, March 31, 1999 -- ALARIS Medical, Inc. (NASDAQ: ALRS) and Masimo Corporation today announced a licensing agreement under which ALARIS Medical plans to integrate Masimo Signal Extraction pulse oximetry technology into its first generation Modular Patient Care System. ALARIS Medical, through its wholly owned subsidiary, ALARIS Medical Systems, has been developing an innovative Patient Care System designed to enhance patient safety by reducing point-of-care medication errors through the integration of infusion therapy and patient monitoring.  Adverse reactions to prescription drugs are the fourth leading cause of death nationally. With a significant market share of all U.S. hospital beds, ALARIS Medical is well positioned to reduce medication errors related to infusion therapy with the introduction of its Patient Care System. ALARIS Medical believes the use of Masimo SET pulse oximetry technology, with ALARIS Medical’s Patient Care System, will help establish a new standard for patient safety. "As a global leader in the development of infusion therapy systems, we wanted state-of-the-art pulse oximetry technology for our first generation Patient Care System," said William J. Mercer, ALARIS Medical President & CEO. "Pulse oximeters are used in a variety of situations, but are of particular value for monitoring oxygenation and pulse rates during the delivery of certain anesthetic agents. In every application, accuracy and reliability are critical. Our due diligence, along with published clinical research, indicates that Masimo is rapidly becoming a technology leader in pulse oximetry. We’re very impressed with this company and are pleased to partner with them in establishing a new standard of patient care," he added. "ALARIS Medical’s Patient Care System is being designed to enhance patient safety by reducing point-of-care medication errors through the integration of infusion therapy and patient monitoring," said Robert S. White, ALARIS Medical Corporate Vice President of Business Development. " Masimo has created a novel approach to measure arterial oxygen saturation and pulse rate with significant clinical accuracy even in the presence of high levels of interfering signals or motion artifact. The integration of pulse oximetry into the ALARIS Medical Patient Care System demands the highest level of clinical accuracy. We felt Masimo was the only choice." "Over the past 30 years, ALARIS Medical’s thermometers and infusion pumps have revolutionized and improved how patients are cared for today," said Joe E. Kiani, President and Chief Executive Officer of Masimo Corporation. "ALARIS Medical is once again redefining how infusion of therapeutics and pain relief should be delivered. This is not only an important relationship for the two companies, but I believe it is truly significant for patient care. We are delighted that we can, with Masimo SET pulse oximetry, assist ALARIS Medical in improving patient outcomes." Masimo Corporation is a privately held medical technology company that designs, develops and licenses advanced medical signal processing and sensor technology for the noninvasive monitoring of vital physiological parameters. Masimo has created a fundamentally unique method to measure arterial oxygen saturation and pulse rate. Masimo Signal Extraction pulse oximetry is the only technology clinically proven accurate during patient motion and is designed for accuracy during conditions of low perfusion, bright ambient light and electro-surgical interference. Masimo has licensed its Signal Extraction pulse oximetry OEM boards and proprietary single patient adhesive and reusable sensors to more than 25 international patient monitoring instrument providers including ALARIS Medical Systems. Masimo is located in Irvine, California. ALARIS Medical, Inc., through its operating company, ALARIS Medical Systems, Inc., is known for its IMED® and IVAC® brand names of intravenous infusion therapy systems and Instromedix® cardiac event recorders and pacemaker follow-up systems. The Company’s principal line of business is the design, manufacture and marketing of intravenous infusion therapy products, patient monitoring instruments and related disposables. The Company’s products are distributed to more than 120 countries worldwide. In addition to its San Diego world headquarters and manufacturing facility, the Company also operates manufacturing facilities in Creedmoor, NC; Hillsboro, OR; Basingstoke, Hampshire, UK; and Tijuana, Mexico. Additional information on ALARIS Medical can be found at www.alarismed.com. This news release contains forward-looking statements which are based largely upon the Company’s expectations for demand and acceptance of new and existing products, technologies and opportunities, regulatory approvals and market and industry segment growth. Actual results could vary materially from these expected results due to a variety of factors, including, without limitation, changes in the market, competition, government regulation and foreign operations. Such risk factors are detailed in the Securities and Exchange Commission filings of ALARIS Medical, Inc. including Form 10-K for the year ended December 31,1998.