A <a href="https://en.wikipedia.org/wiki/quadrat_sample" class="extiw" title="wikipedia:quadrat sample">quadrat sample</a> device, used to measure the percentage cover of certain grasses.
<a href="//commons.wikimedia.org/wiki/User:Yohan_euan_o4" title="User:Yohan euan o4">Yohan euan o4</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>