Residium PMT II Mode D'emploi page 12

To prevent inaccurate readings, replace with new
batteries as soon as the low battery indicator lights up or
starts to blink. A test should not be performed when the
battery power is low or weak.
Batteries do not have to be removed when the AC
adaptor is in use.
Cleaning your gemstone prior to testing
Prepare a clean tissue. Carefully retrieve the gemstone
with tweezers and place the gemstone face down on the
table (Fig. 1.7).
Fig. 1.7
Gently rub the table of gemstone against the tissue/
jewellery cloth (Fig. 1.8).
Fig. 1.8
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