Purchased a MF No 1506 tape measure, arrived today.  Every 16” is marked with
two red triangles..

https://dl.dropboxusercontent.com/u/37914238/wood/MF%201506%20marks.JPG
">https://dl.dropboxusercontent.com/u/37914238/wood/MF%201506%20marks.JPG

Any clues as to why every 16” is marked this way ? 


Cheers
Mal
Oz
(Perth to be more precise)