Systron Donner Inertial Delivers 2,500th SDI500 MEMS IMUConcord, CA – February 6, 2018 – Systron Donner Inertial, the world’s leader in high performance MEMS Inertial Sensors & Systems, delivered the 2,500th SDI500 Tactical Grade IMU on January 25, 2018.Weight: 0