MEASURING TAPE 200' OPEN REEL (FT, 1/10, 1/100). In the Keson brand, this product is a fiberglass blade that provides a more accurate measurement than a steel blade. The model has an open spool design that can be easily cleaned of dirt and debris, so it is ideal for use in dirty, dusty environments or outdoors. Its blade shaft is robust and resists breakage if the tape falls. Ideal for use in surveying and engineering applications.