Related to Rodney's request: Getting a grain counting eyepiece is a fairly quick and easy estimation tool. All the accreditation in the world won't help if you don't know the real magnification of the microscope. Yes, the manufacturer's objective has a number stamped onto it, and so does the eyepiece. But it's best to have checked each objective with a magnification standard to verify. If the grain size that you are measuring will be used in an accept/reject decision, you need to have the best knowledge of your system possible.
It's even more important with microscopes with variable magnification, variable focal distance, and digital capture. Of course, a digital capture system will almost always have a built-in grain size measurement routine. If the capture system allows a calibration constant to be applied at specific objective magnifications, make sure that it cannot be changed by casual users of the system.
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Paul Tibbals
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Original Message:
Sent: 07-20-2023 08:32
From: Kevin Haffey
Subject: In need of a Lab Accredited ASTM E112 Grain Counting eyepiece Reticle
Rodney, Try Klarman Rulings, Inc. on the web as www.reticles,com or phone # 800-252-2401. As an ANAB lab assessor and as a Nadcap materials testing lab auditor reticles from Klarman are the ones I see most often in labs.
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Kevin Haffey
Nadcap MTL Auditor
Self Employed,Universal Stainless
Evans City PA
(412) 629-7367
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