GECKO SMA has also had a variant called GEO-2F uses 2Hz components and has 5° tilt tolerance during installation. The lower cost GEO-5F has a 4.5Hz low-end response and 2° tilt tolerance, and the GEO-XF uses a 14Hz components but can be installed at any angle. The 2Hz sensor is perfect as a low cost high sensitivity earthquake sensor when paired with a recorder capable of high gain (small voltage) inputs, or when set for maximum range can detect over 700mm/s of ground motion in blast and other vibration monitoring applications.