I bought a Frankford Armoury Intellidropper. I have to rezero the scale every once in awhile between charges, if let to sit and warm up it will creep up .1-.4 or more in an hour or so. I have read amazon reviews that suggest this has to do with unstable power voltage and a power conditioner will remedy the problem. By zeroing it out whenever I notice it creeping, I have got very accurate loads that were checked with another nice scale. Any electrician types have any advice?