3M Dynatel Locators 7420X Series are high performance locators that quickly and efficiently locate 3M Electronic Marking System (EMS) Tape, Rope and Markers and read/write to 3M ID Markers. It features a lightweight design, large display with easy-to use interface, enhanced connectivity, internal GPS module, and includes Li-Ion battery with built-in charger.3M Dynatel 7420X Marker Locator is capable of locating all models of passive markers that are properly installed. It detects industry standard electronic marker frequencies and EMS Tape and Rope path frequencies. This Dynatel locator has simplified integrated interfaces with precision locating capabilities. A GPS communication system is incorporated into this Dynatel locator to provide GIS mapping. The Dynatel locator operates at a temperature of 4 to 122 °F ( 20 to 50 °C).