ElectroDroid is the most complete and powerful collection of electronics tools in Android Market. It include many features and reference (see the change-log page for a full list of the feature). A must for any enthusiast!!!
You can find tha app in the Android Market.
Search the app in Android marketplace, or scan the barcode on the right.
If you are using an android device just click here to download the donate version, and here to get the free version.
Here you can find some screenshot:
Download now from tha Android Market: