An efficient and common method for reducing noise impact is the installation of noise barriers along roads and railways. The acoustic characterization of noise barriers is a prerequisite for their commissioning as part of the standard technical acceptance process, as well as for verifying the performance of existing barriers to assess their effectiveness and compliance with project specifications. International standards EN 1793-5, EN 1793-6, EN 16272-5, and EN 16272-6 define the requirements for noise barrier characterization, specifying measurement and evaluation protocols. Based on years of experience in noise barrier measurements and recognizing the time-consuming nature of existing protocols, we have developed a novel, reliable, and user-friendly instrument that is easy to mount and transport. It simplifies and accelerates the measurement process while ensuring full compliance with the standards. The instrument consists of nine MEMS microphones mounted on a folding frame and a centralized battery-powered platform for simultaneous sound generation and recording. A Bluetooth-connected loudspeaker simplifies the measurement setup process. Measurement and GPS data are stored in internal memory, while Wi-Fi connectivity enables remote operation via a laptop application for measurement control, data download, calculation, and result presentation. By considerably reducing the complexity and duration of in-situ measurements, we estimate that the engineering time required for noise barrier characterization will be significantly shorter compared to existing technology, leading to substantial cost savings and improved competitiveness. This paper presents the developed instrument for in-situ measurements of the sound insulation index and sound reflection index of noise barriers, along with example measurement results.