The SureCall RF signal meter accurately measures wireless signal for Voice/3G/4G/LTE for all carriers in North America (Canada & Mexico included). It features a digital LCD readout for each band. Use the meter to receive and measure an outside RF wireless signal from the air, an installed outdoor antenna or directly connect the field antenna. Unit can also be used to measure signal loss in long cable installation runs. An amazing tool used to determine an ideal location to install outside antennas and achieve optimal signal booster coverage installation.