an apparatus that accurately measures rope , wire , tubing and other materials is herein disclosed . a variety of different - sized models would possess different sized openings . one model with a one - inch opening would be used to measure small wire and cable . another model with approximately a 3 - inch opening would be used for larger electrical cables , rope , tubing and the like . an even large model would be available for measuring ductwork , hoses , and other large diameter material . as the material is pulled through the opening , an optical sensor , similar to that used on an optical computer mouse , accurately measures the material to the fraction of an inch . a mechanical sensor , utilizing a guide wheel is also envisioned . the length is displayed on a digital readout on the perimeter of the invention that is provided with a power button , reset button and the like . it is envisioned that various attachments such as a belt loop , a spool attachment and other items to increase the versatility of the invention would also be provided .