I read the artical that Richgauci had purchase the Dynatel 2273 Cable and Fault Locator For $2500.00 new. Could you let me know where you purchased the unit. What frequency do you use to located a sprinkler valve and do you connect the unit to the common wire and the station wire like on the model #521 to get a louder tone when your over the right sprinkler valve. Give me some information on how well you like the unit and located a sprinkler valve. Why did you not buy the newer Dynatel 2273M model.