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Northern Hardness Tester how to calibrate

ruralearl

Aluminum
Joined
Dec 21, 2007
Location
ne IL
Please tell me how to calibrate a Northern Hardness Tester circa 50's-60's so that the tester reading indicates test block specification. Thank you
 

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eKretz

Diamond; Mod Squad
Joined
Mar 27, 2005
Location
Northwest Indiana, USA
It says how to do this in your 4th photo. Assuming you have a known test block, you put it in the tester and load it, then there's an adjustment on the bottom so that you can set the dial to agree with your known test block.
 








 
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