Soehnle Professional Dual Gebrauchsanweisung Seite 44

8. Optional functions
8.6 Tenfold resolution x10
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The tenfold higher resolution appears by pressing the SEND and then the then
the zeroing key at the same time.
For scales calibrated for legal metrology, the higher resolution appears flashing
for 5 seconds.
For scales that are not calibrated for legal metrology, the higher resolution
appears, until the SEND and zeroing keys are pressed again as when they were
called up.