Definition of hand lens:
(n) :
a part of an object which is held in the hand when used or moved, as the
haft of a sword, the
knob of a door, the
bail of a kettle, etc; that of which use is made; an
instrument for effecting a purpose; a
tool
"the daily handle of a Las Vegas casino is typically millions of dollars."
(v) :
to use the hands; to touch; to feel with the hand
"they have hands, but they handle not - Psalm 115:7"