This is a nice used Banner Glass Fiber Sensor Cable, model IT23S.
Basic Specifications:
Overall length: 36"
Fiber bundle diameter: 1/8"(3.2mm)
Tip diameter: 3/16"(4.7mm)
Steel sheath diameter: 1/4"(6.25mm)
Banner fiber cable specifications here...Shipping weight is 1.5 pounds.
