Tektronix made Oscilloscope probes in a number of standardized mechanical dimensions so that accessories like tips or hooks could be interchanged.
The standards include
- 6/32in probes (6/32" thread)
- Miniature modular probes (5 mm tip diameter)
- Compact modular probes (3.5 mm tip diameter)
- Subminiature modular probes (2.5 mm tip diameter)
- 4 mm