ShipRush can automatically pull the shipment weight from an electronic scale that is attached to your PC. Electronic scales are attached to the USB port on the PC that runs ShipRush (virtual COM ports can allow scales to be attached to an ethernet network, but this is beyond the scope of ShipRush documentation).

Note: Technical support for scales is not part of
complimentary technical support. Hardware
support is available via Z-Firm support
forums (no charge) and via paid support calls with Z-Firm technical
support.
Note: USB connected scales
are the easiest to set up and most reliable in operation.
The following scale models are supported via a USB connection to the PC:
Fairbanks model 70-2453, Ultegra, SCB-9000, R9000, and compatible (the type distributed by many shipping carrier sales reps)
Mettler Toledo PS15, PS30, PS-3L, PS-6L, PS60 USB-attached scale., PS90, and compatible
If you have another model scale by one of the manufacturers listed above, contact the manufacturer and ask if the signaling is compatible with the model listed above (many are).
Scales reported as compatible by the manufacturer:
Fairbanks Ultegra model 21860
New
scales are not cheap, but when purchased on eBay a scale can often be
had for a reasonable price.
Attach the scale to a USB port
If the scale uses AC power, connect it
Turn on the scale
Put something on the scale and check that the scale's display shows the proper weight
Go into ShipRush Settings area
Select Scales
Check 'Use Scale'

Set the scale type and port
Press Test, it should display the rounded-up weight
Close Settings
Ship!