Description A Simple Way to Organize and Mount Probes The IceCap magnetic probe holder universally mounts tubing securely to most smooth locations up to 1/2in thick. Also available as a 2-Tube holder and a 4-Tube holder. Magnetic holder can be fixed on the sump or aquarium wall and can hold up to 4 Probes.   Dimensions (LxWxH): 3.5 x 2 x 1.75in Related