PRESIDIUM PRIM II Manual Del Usuario página 13

To prevent inaccurate readings, replace with new battery
if the "Low Batt" indicator lights up. 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. 1.5).
Fig. 1.5
Gently rub the table of gemstone against the
tissue/jewellery cloth and place the gemstone on the
centre of the Test Pad. Do not use fingers to place the
gemstone on test pad as fingerprint will affect the test
results. (Fig. 1.6).
Fig. 1.6
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