Pipe clamps are quite inexpensive, durable, easily fitted into different sizes, and are an excellent way to attach lab sensors and fix lab tools into positions that can be held stable for long periods of time. A collection of the clamps in all sizes is useful to pre-engineer experiments.
One application of pipe clamps is in combination with rare earth magnets, where they can be used to hold and suspend heavier lab equipment into position during experiments.
You may find it helpful to paint the pipe clamps with engine paint to allow them to be more easily sorted into different bins as they are used throughout the year. The stainless steel pipe clamp is one of the most stable, inexpensive and versatile items in the virtual toolbox. Treat yourself to a whole set of them in all sizes.