In this app. the elongation of the
rod is measured by a micrometer screw reading to 0.01mm bell, buzzer or
galvanometer can be connected to determine the exact point of contact of
screw. it is supplied complete with thermometer -10 to 110°C and one each
aluminium, brass, copper and iron rod length 500 mm any one of which may be
used bell, buzzer or galvanometer can be supplied on request.