Use APKPure App
Get Wifi Signal old version APK for Android
Un "analogique" SMETER WIFI.
A "analogic" WIFI signal strength instrument.
Very simple application for test antenna signal propagation and wifi field.
Scan a net and monitoring signal either by net name or mac address.
Monitoring refresh is almost 3 seconds but exactly depends from your hardware.
It doesn't connect WIFI net for working.
Enjoy.