Introducing the P4SPR 2.0: An upgraded user-friendly device that offers highly specific and versatile detection capabilities, from static to real-time measurements, without the need for detection labels. With its unique design, the device can even detect multi-step binding interactions, providing valuable insight into the binding process. What's more, it's cost-effective and simple to use, making it the perfect choice for researchers across various fields. And with a wide concentration range, the P4SPR 2.0 is suitable for a variety of applications, from protein quantification to environmental testing.