Abstract: A mechanism for connecting a strap to a fabric includes first and second elements to be disposed cooperatively on opposite sides of the fabric and then securely coupled to each other with the fabric forcibly sandwiched therebetween. At least one of the two elements is provided with a non-bindingly held strap-connecting element to which either a strap is permanently connected by an end loop or which can detachably engage to a detachable strap with any known hook, snap-fastener, or the like.

Abstract: Sensor assembly and system for sensing conductivity and thereby controlling the concentration and level of a solution includes first and second probes adapted to be at least partially immersed in the solution whose conductivity is to be sensed. The probes are fixedly supported in a predetermined geometrical relationship with respect to each other in an externally mounted housing. Each of the first and second probes has an outer insulative sheath and an inner conductive electrode, the electrodes being exposed to the solution at least one point when their probes are immersed therein. At least one of the electrodes is recessed a predetermined distance from an open end of its respective sheath so that the solution must fill a predetermined volume in the sheath corresponding to the predetermined distance before contacting the electrode. The probe including that one of the electrodes has a clear path therethrough to permit solution to rise therein to a level of the electrode.