The 10ft long cable can be used with the Well Sounder 2010 PRO to extend the distance from the meter to the probe. When the Well Sounder is being used in conjunction with a WS131 Flow Meter, the 10′ Extension Cable can be used to extend the distance from the Flow Meter to the Accessory Splitter which plugs into the 2010P meter. The cables can be used to create distances up to 200ft and are especially handy for applications where the probe may be in a difficult to reach area or during bad weather to extend the distance to the