Operating Instructions & Parts Manual
Page 7
Fine Adjustment:
31
30
29
Please be sure to make very slight adjustments when calibrating the 900‐345A as this machine is
extremely sensitive to any movement.
Remove the top cover off the 900‐345A.
Adjusting
the
set
screw
that
controls
the
Indicator
needle
starting
point:
Carefully hold the set screw with a thin blade regular screwdriver. While holding this screw
steady, carefully loosen the set screw hex nut. Making a very slight turn Counter‐Clockwise on the
set screw, you will see the large needle on the dial begin to turn counter‐clockwise on the dial.
Continue turning until there is no more contact between the set screw and needle adjuster.
At that point turn the set screw until it just touches the adjuster and snug the hex nut back in place
while holding the set screw to prevent it from turning.
Take a minimum of 3 tests on your test block to make sure the machine is reading correctly. If
readings are low, you will need to back off on the set screw a little more. The opposite if readings
are high.
Hex Nut
Set Screw
Back side of indicator
Adjuster Knob
