dewickt
Will fix about Anything
Could be that the zero point for the meter has shifted; this is a mechanical adjustment that can be effected by shipping. Could also be a shift caused by static electricity, on a nice dry day you can rub the glass with a dry cloth and move the meter with the static charge. The charge will go away in an hour or a day or two, also can be helped along with an anti static sheet from the cloths dryer, pull a used one from the dryer and wipe the front panel, this will help dissipate the charge.