direct-reading
adjective
(of an instrument) calibrated so that a given quantity to be measured can be read directly off the scale without the need of a multiplying constant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for direct-reading
Historical Examples of direct-reading
For insulation tests on installations, direct-reading instruments are frequently used (see Ohmmeter).
The New Gresham EncyclopediaVarious