Optical Comparator Calibration

Robb Precision Tool Services has recently purchased an Optical Comparator which will expand their extensive calibration capabilities to include Radius Gages, Thread Pitch Gages, Thread Mic Standards and other various other gages.

An Optical Comparator is an inspection machine that projects magnified images up to 50x its actual size. The images are put onto a glass screen using illumination sources, lenses and mirrors giving a 2-D measurement. This process allows the technician to measure using the latest technology and error free inspection giving a detailed calibration certification, conforming to the International Standard ISO/IEC 17025:2005 and traceable to NIST.

PH-3515F_QMThe Optical Comparator also allows the technicians to see scratches, indentations and various imperfections. Many calibration laboratories use the general measurement of a caliper or micrometer, using this method it is impossible to see these imperfections and can be a costly and timely mistake.

If the reference gage is out of tolerance and cannot be calibrated, a new gage is necessary. Robb Precision Tool is a distributor for Mitutoyo USA and can replace the gage, saving time and money.

Robert Robb, owner “We started to receive gages from other calibration labs that were not using an optical comparator, only their trained eye and a caliper. Using this process it is impossible give an accurate reading. We purchased the comparator to give our customers a correct and detailed certification.”


Robb Precision Tool Services is an A2LA accredited calibration lab which follows the International standard ANSI/ISO/IEC 17025:2005 and traceable to NIST. Specializing in certification, repair and sales of precision measuring measurement systems including torque wrenches, micrometers, calipers, indicators, various gages, hardness testers, optical comparators, weighing scales, dynamometers, height gages, surface plates and many more. We have three decades of experience in the field of metrology and torque. We offer great solutions that come from commitment to meeting and exceeding expectations in precision measurement.

Robb Precision Tool Services is the largest stocking distributor in the Pacific Northwest for CDI, a Snap-On owned company. We have over 30 years of torque experience and can offer expert advice on what product will best suit your needs.



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