Pro 360 Digital Protractor

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Part# 12-20125
MFR Model# KS5549


The Pro360 Digital Protractor is a revolutionary measuring tool that provides immediate, digital reading of all angles in a 360 circle.The machined aluminum frame is a rigid, light weight, ultra-precise platform that allows a state-of-the-art sensor and its microprocessor circuit to provide unsurpassed accuracy throughout the Protractor's 360 range. Typical used by aircraft builders, maintenance personnel and airport operators.

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  • Full 360 degree range (90 x 4)
  • Easy to read LCD display which intelligently flips over when the unit is upside down
  • Maximum accuracy of +/- 0.1 and maximum resolution of 0. 1
  • Precision, machined aluminum frame
  • Unit can be recalibrated to factory accuracy in the field without special tools or fixtures


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Great, simple to use protractor. Identical to more expensive brand name.

Graham W Verified Purchase


January 22, 2023


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.

Q: I have lost my owner's manual for the Pro 360 digital protractor, do you have it available as a PDF?

Yes, we have added it to the 'Documents' tab of this web page. Please download and review it there.

Q: Where is this Pro 360 protractor manufactured?

This is a Kell-Strom unit, it is made in the USA.

Q: Does the Pro 360 Digital Protractor come with a calibration cert from the manufacturer?

This comes with a certificate of compliance but not a calibration certificate. Per the manual, the new digital protractor must be calibrated before use to ensure accurate readings. Included manual provides calibration instructions.

Q: What are the dimensions of the level how long is my concern?

8 LONG | 1 WIDE | 1-1/2 HIGH | 1-1/2 LBS

Q: Does this Pro 360 protractor unit come with a plastic case?

Yes it does.

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