San Diego, CA, March 1, 2005 -- RD Instruments is pleased to announce a significant purchase of acoustic Doppler products by Ashtead Technology Group. Ashtead Technology is a major equipment rental company with offices located in Houston, Texas; Aberdeen, Scotland; and Singapore. The underwater equipment purchased from RDI includes (7) acoustic Doppler Velocity Logs (DVLs) and (2) 6000m depth rated 300 kHz Workhorse Sentinel Acoustic Doppler Current Profilers (ADCPs). These products were purchased with a variety of options, frequencies and depth ratings to address Ashtead’s diverse customers needs.

Chris Echols, Vice President Ashtead Technologies adds, “These new product additions re-emphasize Ashtead Technology’s commitment to deep water technology and further establish Ashtead as a leader in the worldwide ADCP/DVL rental market. We’ve worked with RDI for many years, and have grown to rely on the consistent quality and performance of their products.”

RD Instruments is a leading manufacturer of acoustic Doppler current profilers (ADCPs) and Doppler Velocity Logs (DVLs) for scientific, commercial and military applications. For additional information please contact RDI at Tel. +1-858-842-2600 / E-mail rdisales@teledyne.com, or visit www.rdinstruments.com.

For additional information on Ashtead Technology’s worldwide equipment rental services, please contact Chris Echols in Houston Texas at Tel. +1-281-398-9533 / E-mail chris.echols@ashtead-technology.com, or visit www.ashtead-technology.com.

For information on RDI’s full line of DVL products, visit www.dvlnav.com, or contact Graham Lester at (Tel. +1-858-842-2600 / E-mail: glester@teledyne.com.)

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