Instruction Bulletin 405
March 3, 2026
BM Digital Micrometer setting instructions:
Turn the thimble until the ‘0’ line on the thimble lines up with the vertical line nearest the spindle lock ring.
NOTE: MICROMETER CAN NOT BE PROGRAMMED IF THE LETTERS INC APPEAR IN THE DISPLAY. To get rid of
INC, quickly press the in/mm/ABS button.
Instruction Bulletin 275
February 20, 2013
To set or edit micrometer:
Press and hold the set/on button and the + or – button at the same time. “Set” will flash in the display. This places the
micrometer in edit mode. (CAUTION: use a pencil tip or something similar to gently push the small round buttons - they
are quite small and a bit delicate.)
Press and hold the + or – buttons to change the display number to the minimum bore diameter determined earlier
(example; 1.00). Caution: Pushing the + or – buttons and holding in place will cause the numbers to scroll automatically.
The numbers will count slowly at first and once 0.010” has been counted off the scrolling speed will pick dramatically.
After you have reached the desired number in the display, press the set/on button twice quickly to exit the edit mode.
“Set” should no longer be flashing in the display. The micrometer is now ready for use.
CAUTION: AFTER MICROMETER SET-UP IS COMPLETE, DO NOT PUSH SET/ON BUTTON AGAIN. PUSHING THE
SET/ON BUTTON DURING USE WILL RETURN THE DISPLAY TO THE ORIGINAL MINIMUM BORE DIAMETER.THE
ONLY TIME YOU SHOULD USE THE SET/ON BUTTON AGAIN IS TO- A.To shut micrometer off at which time you push
and hold the button or B. to turn micrometer display back on at which time you push button one time. The display will then
show the last reading before micrometer was shut off.
CAUTION: DO NOT BACK THE THIMBLE ALL THE WAY OUT TO THE END OF IT’S TRAVEL.ONCE THE THIMBLE IS
BACKED ALL THE WAY OUT, IT WILL NO LONGER ROTATE PROPERLY AND THE DIGITAL HEAD WILL NEED TO
BE REPLACED.
Micrometer is calibrated in inch mode. If metric is desired, press and hold in/mm/ABS button until mode changes to metric
(approximately 3-4 seconds). A quick press of the in/mm/ABS button will put micrometer in ABS mode: 0.000, with
another quick press returning it to initial setting.
Calibrate the BM fixture by placing the calibration ring (1.000") on the post. Turn the thimble until the micrometer contacts
the calibration ring. Use the set micrometer instructions above to set the display to 1.000".
The BM fixture is now calibrated.
Instruction Bulletin 275
February 20, 2013
Procedure:
The short vertical lines that cross the horizontal scale on the micrometer sleeve are reference marks. Set the zero on the
micrometer thimble even with the first vertical line and note the size shown in the digital display. Record this size for future
reference. Now follow the same procedure for each line and record the sizes. At any time you feel your micrometer is
reading incorrectly, you can quickly refer to the recorded size of the line closest to the range you are using and check that
the micrometer is still accurate.
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