A full version app for Android, by Neno Tech.
WiFi Signal Strength – Block WiFi is a simple, handy tool to use. With this app, you can view your current WiFi connection signal strength, so you can walk around your house, work, or anywhere you’re connected to WiFi to find the best connection and you can find out which corners of your office or home are having the best reception.
If you want to use it to find out which corner of your house or office is having the best reception, then simply open the app and select the area you want to know more about. If you want to know the exact signal strength, then select the “View” option.