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Not sure how long it had been sitting on the shop shelf but found the issue the first time I used it.

Jit mine went back to the wholesale who reportedly said it was stuffed, bad unit for whatever reason. Was refunded my money.
Probably not that much useful info for you unfortunately!

Took it back on Monday, they are going to test it and let me know......

New in the box, going to test it again today and if no luck its going back.

No major sources of interference i can think of.

I'm going to take it into work and test in a lab that is setup for precision instruments (concrete bench and conditioned power supply) I it works...

Got my greasy mitts on a RCBS chargemaster lite, so far cant say i'm too impressed.

Running through the calibration sequence (after 30min warm up period) the 100g check weights value drop rapidly...