Electronic 3 Point Internal Micrometer
0.787-0.984″/20-25mm

This versatile and self-centering 3 point internal micrometer are designed for accurate and repeatable measurement of internal diameter. Measurement can be taken closed to the bottom of a blind hole or in a deep hole with extension rod. 3 point anvils evenly spaced at 120 degree apart, contact the internal wall surface and find the true alignment with the bore axis for accurate ID measurement.

Calibration procedure:

• 1) Before placing the micrometer into the supplied ring gage, press and hold the on/off/set key to go into the preset mode and use either hold or in/mm/0 key to adjust value as the ring gage diameter and toggle the decimal place by pressing the on/off/set key; Once the ring gage diameter is set in the Preset mode, press and hold the on/off/set key to exit the Preset mode.
• 2) Place the internal micrometer into the supplied ring gage and ensure repeatable contact with the internal bore surface
• 3) While the micrometer still is in the ring gage, press & hold the in/mm/0 key to set the micrometer to its preset value

Features:

• Self-centering 3-point contacts for accurate and repeatable measurement of internal diameter
• Measurement can be taken closed to the bottom of a blind hole or in a deep bore with extension rod
• Supplied with setting rings and extension rod
• Resolution: 0.00005 / 0.001mm
• 3-point contact with tungsten carbide measuring anvils on range above .5″;
  Stainless steel anvil hardened to HRC 48 on range below .5″
• Ratchet thimble
• Preset key allows to preset to any values
• On/Off/Set, Hold key, inch/metric/0 key available
• Furnished in fitted case

Specifications:

SKU 303-255 BORE GAGE CATEGORY Electronic MEASURING RANGE – BORE GAGE 0.787 – 0.984″ / 20 – 25 mm BORE DEPTH 2″ SETTING RING 0.9843″ CONTACT POINTS 3 RESOLUTION 0.00005″ ACCURACY 0.00016″ / 0.004 mm

See all Electronic 3 Point Internal Micrometers & Sets