-let’s say that tenmars TM190 is a good detector ALL IN ONE, it can measure with good approximation electric field of high frequency radio networks up to 3.5ghz, and also magnetic field of low frequency electrical networks (50hz).
-Has a beautiful display that simultaneously provides all the info you need to have a precise situation of the area.
-Powered by 3 AA batteries from 1.5v, the autonomy is 5 hours
-With small size you can carry it in your pocket.
-The accuracy of the measures is not high but acceptable.
MY PERSONAL OPINION: I don’t like all-in-one solutions. Personally I would go to other products with more accuracy, even the same Tenmars made more powerful devices, which perhaps have less display colors, but more performance.