Scientist at HUBC carefully determine the center of gravity of a Styrofoam cylinder designed to carry both radiosondes mounted at opposite ends. Achieving proper balance is critical to ensure a stable and detangled ascent to target altitudes of approximately 22 km. During flight, both instruments will transmit atmospheric data used to study atmospheric rivers. This dual-launch configuration serves a key scientific objective: validating the pressure and humidity measurements from the iMET-4 against the better-established RS-92 reference.