Justkeylock

Working on your computer for prolonged periods of time might make some of its components, such as the keyboard or mouse, prone to malfunction.
If you are in need of a lightweight solution to perform simple functionality-related check-ups on your keyboard, you can rely on Justkeylock, as it can provide you with quick results.
Please be aware that this application requires .NET Framework in order to run as intended.

Simple application that comes with a minimalistic interface

This lightweight program comes with a non-sophisticated, simple user interface that encompasses few, yet intuitive controls that you can interact with. Therefore, a wide range of users is provided with high overall accessibility, regardless of their PC operating skills.
Given to its simplicity, Justkeylock features no form of help documentation, since its only purpose is to display basic information about your keyboard.

Check your keyboard's Num Lock, Caps Lock and Scroll Lock statuses

You can turn to this application if your keyboard has malfunctioned and you need a quick, efficient way to check whether the Num Lock, Caps Lock or Scroll Lock buttons are activated or not. This tool displays the names of the keys mentioned above, as well as a checkbox next to each item. The checkbox displays a tick whenever its corresponding lock key is activated.
The application does not refresh the status in real-time by default, but you can set it to do so by toggling the Auto-Refresh function on. Alternatively, if you want to do so manually, you can click the Refresh button for the same outcome.

As a conclusion

To wrap it up, Justkeylock is a lightweight application that allows you to view basic information about your keyboard, thus providing you with useful details in case you have a malfunctioning device. It comes with a user-friendly, minimalistic interface that encompasses straightforward functions, but no form of documentation is provided whatsoever.