3M Dynatel Locators 1420X Series determines exact location of underground 3M Electronic Marking System (EMS) Markers. This locator reads, writes and locates 3M iD Markers. It locates 2 different marker frequencies simultaneously. 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 1420X Marker Locator is capable of locating all models of passive markers that are properly installed. It detects industry standard electronic marker 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).