Product review (2 stars): New is not always better.
I have an older 611.  Grandkids broke the outside sensor.  AcuRite repre said the new sensor would work with other unit.  It doesnt and they cant figure out why.  So I get a new unit LOL what a joke even when senor is with it reads 7-10 degrees off!
New unit is all plastic and very light weight.  Not Like my old unit.  I wish I could send the new one back.  No can do