Comtorgage Mechanical Amplifiers should be selected with graduations that are no more than 10% of the part tolerance. Numbered graduations represent the number of thousandths of an inch or hundredths of a millimeter from zero. The range of the dial should provide a clear tolerance band with sufficient approach and over-travel on either side of the band.
mechanical amplifier

faces specialty


COMTORGAGE offers an electronic system that allows you to use the output of your choice.
coupler electronic amplifiers


  • Means to bringing electronic measurements to the production line and the inspection bench
  • Provides a means to interface with various Statistical Process Control (SPC) Devices for recording permanent readings
  • 3/8” Diameter access hole to accommodate the stem of most electronic Digital Indicators. Can be fitted with an 8MM split bushing when specified.
  • Adaptable to various standard, special or customized Comtorgages
  • Resolution based on model indicator.


  • Certification
  • Special Marking (limited to 5 lines, 15 characters / line)
  • Special Dial
  • Shaded Tolerance Indicating Dial
  • Special Tag


Comtorgage offers certification in either of two forms:

Certification of Conformance

Conforms to Comtorgage specifications.

Certification of Accuracy

Actual measurements are recorded.
 confoormance certificate
accuracy certificate
(Mechanical Amplifier / Coupler / Calibration Checkers)
* Click on images above for larger view.
Calibrations performed on equipment traceable to N.I.S.T. 
Measurement and method of recording conforms to ISO/IEC 17025 and ASME / ANSI B89.1.10M Section 8.4

Testing Equipment for Amplifiers

digital checker                 gage calibration checker equipment

Precision spindle fits into Amplifier, in place of expansion plug, to check zero and calibration thru its range.