Low-tech calculator (5,4)
I believe the answer is:
slide rule
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">low-tech calculator</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for slide rule that I've seen before include "Logs on here" , "Old calculator" , "Instrument for rapid calculations" , "facilitates calculations" , "Obsolete calculator" .)