Do you like to keep an eye on your PC's performance? Big Meter Pro is a basic monitoring tool with a speedometer-like display.
The main gauge show you CPU usage, and in settings you can toggle smooth motion of the needle and whether it is blue or red. The two small meters show your RAM and Disk usage. In settings you can choose to run at startup, enable alerts and define the Disk you want to monitor (maybe you have more than one HDD).
There is nothing more to this utility. It's very attractive, but doesn't offer you as much information as other system monitors. The alerts are useful, but if your CPU or memory usage is critically high, you will be aware of it due to your PC grinding to a halt and getting hot!
Big Meter Pro is an attractive performance meter, but it's very limited and really not much more than window dressing for your desktop.