Click here to see the major applications which was performed by Ritec's Acoustic Measurement System.     Click here to see the titles of papers which was performed by Ritec's Acoustic Measurement System. In case you are considering to purchase the system, ask the paper copies, which will be sent by post.     Click here to see the site which introduces ultrasonic instrumentation by NDE center of Iowa State university.       This site is for the instrument users only. Shows how to react in case the instrument is or seems in trouble.