Aparently up to 2M range with this one.... Might give it a go when I have some free time!! http://www.micro-examples.com/public/microex-navig/doc/090-ultrasonic-ranger Mike -- KIWACAN Electronics Design Concept to Production Mobile: +64-21-249-5674 Phone: +64-3-347-3311 Fax: +64-3-347-2123 Website: http://www.kiwacan.co.nz