Nedo Measure-Fix Extenion Tape Measure with a measuring range of 15 inches to 39 inches
The Nedo measure-fix is a thoroughly tried-and tested telescopic rule which is designed for measuring the widths of openings.
The  built-in metal measuring tape and heavy duty rewind mechanism are made  to with stand severe stresses and to guarantee accurate measurements,  every time!
Simply place the measure-fix in position, pull out the extending sections and read off the measurement from the analog display.
FEATURES 
•  Telescopic rule with analog display for internal measurements
  Telescopic sections made of sturdy, rectangular-profile aluminum to  withstand rugged conditions on construction sites
•  Sturdy display unit
•  Graduations in millimeters and inches on a dimensionally stable metal measuring tape.
•  Heavy-duty rewind mechanism
•  Spirit levelfor horizontal and vertical alignment
•  Reliable, sturdy and precise