01
It prints the label the fixed machines print
Four inches is the standard 100 mm stock — an address label, a carton label, a pallet label, a rack location. If the label already comes off a ZD421 or a ZT411 at that width and you now want it printed out on the floor, this is the one that does it. The three inch machine cannot, at any setting.
02
6800 mAh, against 3250 on the three inch
Roughly double, and it is the reason this gets bought even where three inches would have done. A printer on a trolley or a forklift that runs most of the day is a different duty from one that prints forty labels at the shelf edge, and a flat battery mid-shift costs more than the difference in price.
03
Labelling the rack while standing at the rack
This is the job the photograph shows, and it is the one worth understanding. Bin and rack labels are ordinarily printed in an office, carried out on a sheet, and stuck up by somebody working from a list — which is where locations end up on the wrong bay. A four inch mobile printer moves the printing to the racking, so the label is made at the place it is about to go on.
04
No ribbon, so ask how long the label has to last
Direct thermal, like every mobile printer here. Nothing to load and nothing to replace, and the print fades with sunlight, heat and handling. A despatch label read this week is exactly right. A rack label meant to still be scanned in three years is not — that wants thermal transfer on a fixed machine, or not a printed label at all.
05
And the same warning as its smaller sibling
The Plus models take different firmware and drivers from the ZQ600s they replace. Same printer to look at and to use; Zebra redesigned the electronics to keep the line available. Worth knowing before it joins a fleet somebody already manages.
Four inches is the whole question. If nothing you print on the move is wider than a shelf ticket, the ZQ620 is $100 less and lighter to carry all day. If anything is a full despatch or pallet label, this is the only one of the two that prints it, and the bigger battery comes with it.
It is 203 dpi, which is right for barcodes and plain text. Both mobile printers are, and neither is the machine for small type or a dense 2D code on a little label.