SeePU is a multi-meter utility app capable of monitoring how much RAM and CPU is being used, and network activity. The app remains in your notification bar, with an icon changes color according to your usage. The app gives you options as to how often to be notified and what to be notified about. You can choose to see just the RAM or both, and the network utility lets you choose to see upload and/or download information. This app could be especially helpful figuring out which app is causing lags or where there might be a memory leak. Additional features such as graphing your data and the the ability of "killing" a process are available in the SeePU++ app.