I have various probes that I use with a digital oscilloscope for various types of tests. Pressure sensors, temperature sensors, etc. are inexpensive and can measure many different things from stove draft to car cylinder pressure and vibration. I bought these connectors to be able to easily switch between sensors. Many sensors require a 5V power supply. So even if you connect BNC connectors (the most common connector for oscilloscope test leads) to each sensor for signal and ground, you still need a separate power and ground output for your power supply. I use a USB rechargeable battery as my portable power source, so it makes sense for me to use these ports to quickly switch between sensors. So all I have to do is make a pigtail with a sensor connector on one end and some bare wires on the other end. I can swap out the sensors in seconds and be up and running. So far I've only done limited testing and everything works fine. Signal noise hasn't been an issue so far, but this type of setup isn't really suited for anything other than low-frequency, relatively noise-tolerant testing. In other words, many automotive and Arduino type sensors. Overall I am very happy that I bought them. I can put together many temporary test setups very quickly. I personally wouldn't use them for anything other than low voltage, low current, and signaling applications, but for the tests I run these things are a real time saver.