Originally Posted by sewmany

The bloc-loc rulers. Helps to square up hst blocks. And saves me 1/3 the time compared to regular rulers. They are a bit pricey but i ask myself how much my time is worth when i have to sq up 100's of hst.
Caution: if flying have them carry rulers in their carryon. The extreme change of temperature where they store luggages can crack the all rulers.