The triaxial accelerometer is a device designed to measure the acceleration at the point where it is installed, a fundamental parameter for determining vibration frequencies and performing structural modal analysis. By carrying out periodic measurements over time, it is possible to identify variations and structural anomalies related to local damage, changes in geometry, or alterations in material behavior, ultimately allowing assessment of the current condition of the structure (Structural Health Monitoring). The GESTECNO accelerometer is based on capacitive MEMS technology with a digital output and can be connected to a data logger via an RS485 serial line, using a proprietary communication protocol. It contains a high-resolution accelerometer sensor and a backup accelerometer sensor. The presence of a dual onboard accelerometer allows the operator to immediately determine whether an anomalous reading is due to a malfunction of the measurement sensor or to an actual structural anomaly, by comparing in real time the outputs of the two sensors, thereby avoiding unnecessary inspection interventions. The sensor is also equipped with an integrated GPS module which, through communication with multiple satellite constellations, ensures acquisition synchronization, a key requirement for modal analysis. The signal acquired by the sensor is digital, and 24-bit conversion is performed directly on the onboard electronic circuit, eliminating signal losses due to noise introduced along the cabling.