Setting the Zero-Set Indicator

Step 1

  • Assemble the micrometer head on one end of the extension and the foot assembly on the opposite side
  • The surface to be measured should be as flat and smooth as possible
  • Mark the location of the micrometer/foot locations to be used for leveling
  • Set the micrometer head at 0.500” as the base figure to work from later
  • Place the micrometer head on the left-hand mark and center point of the foot assembly on the right-hand mark*
  • Turn the aluminum knob on the level beam segment to zero the bubble in the vial
  • Rotate level assembly 180° and position the micrometer on the right-hand mark and the foot assembly on the left-hand mark
  • The vial bubble will move slightly



Step 2

  • Adjust the micrometer thimble so the bubble moves back to zero: 0.566" for the sake of this example (Bubble in vial is centered between the lines)
  • At this point you can pick the level up to read the micrometer or read as is
  • Subtract 0.500" (the original micrometer setting) from the adjusted number: 0.566" - 0.500" = 0.066"
  • The points are out of level by half of this number or 0.033" (0.066" / 2 = 0.033")
  • Set the micrometer to 0.533” and place the micrometer point on the right-hand mark and place the foot on the right-hand mark (second position)
  • Adjust the knob to make the vial read zero

Step 3

  • Rotate the level assembly 180° once again (original position)
  • Adjust the micrometer head is to zero the vial
  • The micrometer should read 0.467": no matter which way the level is turned, the two points are out of level by 0.033"
  • The vial is now calibrated to zero for any additional measurements
  • To further verify 0.033" out of level, set thimble back to 0.500", Place 0.033" shim beneath the thimble or foot on the low point
  • The vial should read zero
  • Rotate the level assembly 180° and the level vial should still read zero


* The bar stand center contact point is designed to be 0.003”-0.007” longer than the outboard points. The center contact point is where the level measurements are taken from. The function of the outboard points is to help to stabilize the level assembly, and keep the level assembly from falling over.