Go to More > Hardware > Weight Scale.

What is the weight scale?

A weight scale reads the weight of a bag or load and puts it into the order, so you do not type it. Use it for products priced by weight, such as wash and fold. The scale connects to your computer by USB, serial port, or WiFi, and the POS reads it through QZ Tray.

Hardware settings are saved per station. Set up the scale on each station that has one.

What you need

A supported scale, connected and powered on
QZ Tray installed and running. See How to set up QZ Tray.
A product that uses weight. Set the product type to Weight and USB Weight Scale.

Weight Scale

Manufacturer: Select your scale brand: Gram Xtrem, Mettler Toledo, Avery, Avery (alternative mode), Fairbanks, or Other. Try Avery (alternative mode) if the standard Avery option does not read correctly.
Port: Select how the scale connects:
- USB (HID Compliant): A plug-and-play USB scale.
- WiFi: A scale connected to your network through an adapter.
- COM1 and other COM ports: A scale connected by serial cable, or serial to USB adapter.
Scale Test:
- Test Read: Reads the weight now. Put something on the scale, then select Test Read to check the number.
- Discover USB Scales: Searches for USB scales connected to this computer.

USB HID Scale

This section shows when Port is USB (HID Compliant).

Selected Device: The scale the POS uses. It shows “No USB scale selected” until you choose one.
Discovered Devices: The scales found when you select Discover USB Scales. Select your scale from the list.

Select Save when you are done.

Set up a USB scale

Connect the scale to your computer with a USB cable and turn it on.
Make sure QZ Tray is running.
Go to More > Hardware > Weight Scale.
Choose your Manufacturer and set Port to USB (HID Compliant).
Select Discover USB Scales, then select your scale from Discovered Devices.
Select Test Read to check it works.
Select Save.

Set up a serial scale

Connect the scale to your computer with a serial cable, or a serial to USB adapter, and turn it on.
Make sure QZ Tray is running.
Choose your Manufacturer.
Set Port to the COM port the scale uses, for example COM1.
Select Test Read, then Save.

Use the scale on an order

Add a product that uses Weight and USB Weight Scale.
On the New Order page, a pop-up asks for the weight.
Type the weight, or select Read Scale to take it from the scale.

Common questions

Which scale should I buy?

The scales we know work well are the Mettler Toledo BC-60 and BC-150 (USB HID and serial) and the Fairbanks Ultegra 29824 (USB HID). Other USB HID and serial scales may work, but we cannot guarantee it. The BC-60 handles up to 150 lbs, the BC-150 up to 300 lbs on a larger platform.

Should I choose USB or serial?

USB is easier because it is plug and play. Serial needs more setup but is stable for busy stores.

Does the scale work on a Mac?

It can, but the connection may be less stable. A Windows PC is more reliable.

My scale does not show in Discovered Devices.

Check the scale is on and plugged in, and that QZ Tray is running. Then select Discover USB Scales again. Make sure the Port is set to USB (HID Compliant).

The weight reads wrong or does not read at all.

Try a different Manufacturer option, for example Avery (alternative mode) for Avery scales. Then select Test Read.

Can I connect my scale over WiFi?

Yes, with a WiFi adapter such as the Air Console Mini, tested with the Mettler Toledo BC-60. Select WiFi as the Port, then enter the scale’s IP address.

Why does the order not ask for a weight?

The product needs to be set up as Weight and USB Weight Scale in your product settings.

Is my Avery scale supported?

Avery scales connected by serial work for some stores, but they are not officially supported.

Weight Scale Settings