I have had trouble with digital gauges; I don't see how the arm could be changing so it may be the guage. Unless the counterweight has a little play in it; I have not had this problem with my Graham 2.2.
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These digital gauges can make you mad. When you do multiple test, you have to place the needle always exactly at the same place,
You can put some fluid into the bearing, but you can also not do it. Don't worry about that. More important is, the bearing was protected with the plastic cap when shipped to you.
What scale are you using?
The error you are getting is only 0.07g, maybe your scale is not that accurate/reliable?
If your scale contains ferrous parts the difference may be due to magnetic attraction (due to the cartridge magnets).
To get around this you could use something like this.
It's not the digital gauge, I replace the batteries. I tested the gauge with my other arm's, VPI 12.6, VPI 12.7 and Tri-Planar Mark VII UII Ultimate model, the gauge works well.
Syntax,you must be right, the bearing was not protected with the plastic cap when shipped to me.The arm was not even packaged properly in the original box, was in an inverted position...
I am thinking to upgrade with the new Phanton II bearing cap...It may solve the problem...