It appears you're asking about a used BenQ GL955A PC monitor. The BenQ GL955A is a 18.5-inch LED monitor with a resolution of 1366x768 pixels. It's a budget-friendly monitor suitable for basic computing tasks, such as web browsing, office work, and light multimedia consumption.

When purchasing a used monitor, there are a few things you should consider:

1. Condition: Check the physical condition of the monitor for any scratches, dents, or other damage. Ensure that the screen is free of dead pixels or noticeable discoloration.

2. Functionality: Test the monitor to make sure it works properly. Check for any flickering, backlight bleeding, or other display issues.

3. Connectivity: Ensure that the monitor has the necessary ports to connect to your computer or other devices. The GL955A typically comes with VGA and DVI inputs.

4. Age: Consider the age of the monitor and how heavily it has been used. Older monitors may have shorter lifespans or be more prone to issues.

5. Price: Compare the price of the used monitor to its current market value and the prices of similar monitors. Make sure you're getting a good deal based on the monitor's condition and features.

6. Warranty: Check if the monitor is still under warranty, as this can provide you with some protection in case of any issues after purchase.

Overall, if the used BenQ GL955A monitor meets your needs, is in good condition, and is priced reasonably, it could be a suitable option for your setup. Just be sure to thoroughly inspect it before making a purchase.