Measuring devices (6)
I believe the answer is:
meters
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">measuring devices</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a meter measures something)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for meters that I've seen before include "Measuring devices" , "Measuring instruments" .)