The MetOp-SG-B1 satellite being prepared for vibration tests. The MetOp-Second Generation (MetOp-SG) mission comprises three successive pairs of satellites to deliver data for weather forecasting and climate prediction for over 20 years. Working as a pair in polar orbit, the A-type and B-type satellites are equipped with complementary suites of instruments to provide high-resolution measurements of temperature, precipitation, clouds, winds, and more. The A-type satellites carry optical and sounder instruments, and the B-type satellites carry microwave imaging instruments.