Fractional Digital Caliper 3 Inch

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Part# 12-02307
MFR Model# 1433


Fraction+ Carbon Fiber Digital Fractional Caliper (3") The Carbon Fiber Digital Fractional Caliper brings you three universal systems of measurement, making it an equally practical choice for both professional and do-it-yourself projects. The high-contrast digital display easily switches between inches, millimeters and fractions, with guaranteed accuracy to 0.001.

In addition, the lightweight, non-marring carbon fiber construction delivers accurate readings of inside, outside, step and depth measurements. This 3" caliper fits conveniently into your pocket for working in the field.
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WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


  • 3 Carbon Fiber Caliper.
  • Lightweight, non-marring construction.
  • Tri-Mode digital display inches, millimeters, and fractions.
  • For making inside, outside, depth and step measurements.
  • Range 0-3" (0-76mm)
  • Resolution 0.0005 (0.01mm or 1/64").
  • Accuracy 0.001 (+/- 0.02mm).
  • Auto on/off feature preserves battery life.
  • Compact, pocket-sized design.
  • Bar scale is graduated in inches and millimeters.
  • Free-wheeling friction roller advances and retracts slide.
  • Extendable depth gage for use in slots and small holes.
  • Replacement Battery - SR54 or LR54


Ive had mine since 2013 and still going strong. Ive never noticed issues with accuracy or precision. It disappears in my inspection kit and in a shirt pocket. I wish it also had a depth gauge.

Christopher A
April 23, 2020

A great little pocket caliper. Ive used it in the field for about 5 years and when I dont want to bring the Mitutoyo. Ive had no issues with repeatability.

Christopher B
July 16, 2019

I wanted this for checking material thickness when out shopping. Something I could keep in my pocket without ripping holes through. The readings are so variable and imprecise, I do not trust these for even hobby projects. 1- Not precise. Every measurement on the same material is always a bit different. 2- Requires an odd battery that is half the thickness of the battery normally used in most electronic calipers. 3- Requires a piece of tape over the battery lid so it does not randomly pop off. It is not a matter of cost. I would pay much more for an accurate, lightweight pocket friendly digital caliper. ... without fractions.

John H
February 22, 2019


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

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