Inquiry (采购产品): Optical Tachometer Sirs, What is the measurement distance for your "optical tachometer" products? Do you have an optical product that can measure rpm (like a propeller or rotor) from a distance of 20 feet? Bill Goad **** Hidden Message ***** William Goad 23663 USA Company: NASA/LaRC E-mail: wkgoad@cox.net **** Hidden Message ***** wkgoad@cox.net
