An open source remote diagnostics platform for custom electronics in experimental acquisition setups has been developed, targeting nuclear and high-energy physics (HEP) applications. We aim at enabling remote access to instrumentation hardware prototypes located in radiation-controlled areas by using existent network infrastructures. The platform relies on two components: a graphical user interface (GUI) developed in GNURadio and a remote hardware bridge (HB). The GUI was designed using the GNURadio’s optimized building blocks, ensuring a fluid visualization of real-time pulse traces and energy spectrum. No third-party libraries are used, turning our solution into an easy drop-in tool for instrumentation diagnostics in HEP and radiation-related experiments. Reliable communication between the remote instrument and the GUI is accomplished using TCP/IP, carried out by the HB in case of remote instruments without network interface. A Raspberry PI Zero-W is tested as the HB to demonstrate the few computational resources required for this end.