Topband: Binocular Cores

[Roger Parsons via Topband]

I have some binocular cores which I know are FairRite mix 73. I have others 
which I thought were also mix 73. However, the first ones measure about 50k 
Ohms with ohmeter prods onto their surface, whereas the others only measure 
about 1k Ohm. I don't believe that that is a defined parameter, and am aware 
that the test is not very scientific, but I am surprised to see such a 
difference. Thoughts?
73 RogerVE3ZI
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