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Wilson Hardness Tester model 4DT RB operation?

Mumf

Aluminum
Joined
Apr 11, 2009
Location
ontario canada
Hi, this is a model with a digital display. I have found and read instructions on similar models but with the dial displays, 4jr models, etc. They seems to be almost identical but i cannot get mine calibrated. Not sure if there is a different procedure or if mine has a broken circuit. I get readings of around 100 and very little difference not matter if in B or C modes, etc.
I tried the Canadian rep and he said there is nothing on these models. Can anyone help with documentation or experience with these models? tks.
 








 
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