Our tosai (one year old Koi) cost $50. Medium, large and jumbo sized Koi are priced on a per fish basis depending on: size, body conformation, skin luster and color.
The OFLM-1000 is an essential tool for constructing and testing. fiber optic cables, fiber optic sensors, fiber optic interferometers, and other optical fiber systems where length must be controlled.
I found this on the web: http://www.directindustry.com/prod/caltek-industrial/cable-length-measuring-devices-50655-349248.html. I also believe that it uses the same concept with what DAB is suggesting. I guess it uses t=RC and R=pL/A formulas to compute for the cable length.