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Visio Magnification

We have a new Tesa Visio 300 DCC that was just calibrated last week. When I attempt to change the magnification, which is at the lowest setting (.7) I get an error saying that I am attempting to move outside of the calibrated range and it automatically goes back to .7 magnification. I can't seem to get a call back from tech support so I figured there may be someone on here that may know what the heck is going on. Any takers??? Thanks.

Aren