The XT line offers the best underground utility locating devices in a little package deal. This portable utility locator program extends for bigger sensitivity and retracts for simple carrying with a Software belt. The 2nd generation technology replaces the prior OM1 range, which happens to be now no more offered. https://www.whofish.org/Default.aspx?tabid=45&modid=379&action=detail&itemid=310964&rCode=27