A low cost sensing system that can measure both chlorophyll concentration and turbidity is provided. In the earphone structure, a chamber tube with an adjusting hole or a set of adjusting holes is provided. The locator may further include a surface light assembly and camera andor one or more GPS andor ISM antennas and receiversensor modules. The push rod can be slideably received within the delivery tube and has a distal end for pushing the woven retention device through the distal opening of the delivery tube.