I am looking for a floor scale it must be big enough to place a normal pallet on and must weigh in 1# increments i am not sure weither i want 5,000 or 10,000 capacity also must have a digital readout, there are so many different ones out there why do some sell on ebay for 500 and then when you call a local scale dealer he wants over 1500 is there a difference and which one would you buy?